Brown Sugar and Cinnamon Snickerdoodle Blondies

Name: Brown Sugar and Cinnamon Snickerdoodle Blondies
Prep time: 20 min
Cook time: 28 min
Total time: 55 min
Yield: one 9x13-inch pan, cut into 16 bars
Cuisine: American
Ingredients: 225 g unsalted butter (1 cup or 2 sticks), plus extra for greasing; 300 g dark brown sugar, packed (about 1.5 cups); 100 g granulated sugar (about 0.5 cup); 2 large eggs, at room temperature; 1 large egg yolk, at room temperature; 2 tsp pure vanilla extract; 280 g all-purpose flour (about 2.25 cups, spooned and leveled); 1.5 tsp cream of tartar; 1 tsp baking soda; 1.5 tsp ground cinnamon; 0.75 tsp fine sea salt; 50 g granulated sugar (about 0.25 cup), for the topping; 1.5 tsp ground cinnamon, for the topping; Flaky sea salt, for finishing (optional but recommended)

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Close your eyes and picture the best snickerdoodle you have ever eaten: crisp at the edges, impossibly chewy in the center, with that signature tang from cream of tartar and a warm, crackling cinnamon-sugar top. Now imagine that same flavor packed into a thick, buttery blondie bar you can cut into generous squares and share with a whole room of people. That is exactly what these Brown Sugar and Cinnamon Snickerdoodle Blondies deliver, and the moment they come out of the oven, filling your kitchen with the scent of browned butter and cinnamon, you will understand why this recipe has become a permanent fixture in our baking rotation.

What sets these blondies apart is the brown butter base. Rather than simply melting the butter, we cook it until the milk solids turn a deep amber and the whole kitchen smells like toffee. Brown butter adds a layer of nutty, caramel-like complexity that plain melted butter simply cannot replicate, and it pairs with the dark brown sugar to create a depth of flavor that tastes like you spent far more effort than you actually did. We also keep the cream of tartar, the hallmark of a true snickerdoodle, in the batter itself for that subtle, tangy backbone alongside a generous dusting of cinnamon sugar pressed into the top before baking to get that iconic crinkled, slightly crunchy finish.

These blondies fall firmly in the easy to medium category. There is one pan, one bowl, no stand mixer required, and no chilling the dough. If you can melt butter and stir ingredients together, you can make these. They are perfect for the enthusiastic beginner who wants a genuinely impressive result, for the seasoned baker looking for a fast weeknight treat, and for anyone who needs to bring something to a potluck and wants to return home with an empty pan.

Prep: 20 minutesTotal: 55 minutesYield: one 9×13-inch pan, cut into 16 barsDifficulty: ★☆☆ EasyOccasion: Everyday Treat

✓ Vegetarian

Servings:

16

servings

Ingredients

Topping
225 gunsalted butter (1 cup or 2 sticks), plus extra for greasing
300 gdark brown sugar, packed (about 1.5 cups)
100 ggranulated sugar (about 0.5 cup)
2 largeeggs, at room temperature
1 largeegg yolk, at room temperature
2 tsppure vanilla extract
280 gall-purpose flour (about 2.25 cups, spooned and leveled)
1.5 tspcream of tartar
1 tspbaking soda
1.5 tspground cinnamon
0.75 tspfine sea salt
50 ggranulated sugar (about 0.25 cup)
1.5 tspground cinnamon
Finishing (optional But Recommended)
—Flaky sea salt

Ingredient Substitutions

unsalted butter

Salted butter: use the same amount but reduce the fine sea salt in the batter to 0.25 tsp
Vegan butter sticks (such as Miyoko’s or Earth Balance): the blondies will be slightly softer and less rich, but still delicious. Brown it carefully as it can spatter more than dairy butter.

dark brown sugar

Light brown sugar: works well but produces a slightly less deep, less molasses-forward flavor
Coconut sugar: use the same weight for a more caramel-like, slightly earthy flavor. The blondies will be a touch drier, so add 1 tbsp extra butter.

eggs

Flax eggs: mix 1 tbsp ground flaxseed with 3 tbsp water per egg, let sit 5 minutes until gel-like. The blondies will be denser and slightly less chewy but still very good.
For the extra yolk only: add 1 tbsp extra butter to the batter to compensate for the lost fat and richness.

all-purpose flour

1:1 gluten-free baking flour (such as Bob’s Red Mill or King Arthur Measure for Measure): use the same weight. The texture will be slightly more crumbly and may need an extra 2 to 3 minutes in the oven.
Bread flour: use the same amount for an even chewier, denser blondie bar.

cream of tartar

Lemon juice: use 2 tsp in place of 1.5 tsp cream of tartar. It provides a similar mild tang and helps with the chewy texture, though the snickerdoodle character will be slightly more subtle.
White vinegar: use 1.5 tsp. It works the same way as cream of tartar chemically, with no detectable vinegar flavor in the finished bars.

Instructions

🔧 Equipment

🥣light-colored medium saucepan

🟫9×13-inch metal baking pan

📄parchment paper

🥣large heatproof mixing bowl

🥣medium mixing bowl

🍴rubber spatula

🌀whisk

🔪sharp chef’s knife

🔵wire cooling rack

🥣small bowl (for cinnamon-sugar topping)

💨7-inch or 8-inch round or square air fryer-safe pan (for air fryer method)

📡12-oz microwave-safe mug or ramekin (for microwave method)

⚖️kitchen scale (recommended)

Prep: 20 minutes
Bake: 26 to 28 minutes at 350°F (175°C)
Total: 55 minutes

Preheat your oven to 350°F (175°C). Grease a 9×13-inch metal baking pan with butter and line it with parchment paper, leaving a 2-inch overhang on the long sides so you can lift the blondies out cleanly after baking.
Make the brown butter: place the 225g of butter in a light-colored medium saucepan over medium heat. Cook, swirling the pan frequently, until the butter melts, foams, and then the foam subsides and the milk solids at the bottom turn a deep golden amber, about 5 to 7 minutes. It should smell nutty and toasty. Immediately pour it into a large heatproof mixing bowl, scraping in all the browned bits from the bottom. Let it cool for 10 minutes.
Whisk both sugars into the warm brown butter until fully combined. The mixture will look like wet sand at first, then become thick and glossy. Add the eggs, egg yolk, and vanilla extract, and whisk vigorously for about 90 seconds until the batter is smooth, thick, and just slightly lightened in color.
In a separate bowl, whisk together the flour, cream of tartar, baking soda, cinnamon, and salt. Add the dry ingredients to the wet ingredients and fold together with a rubber spatula until just combined with no dry streaks visible. Do not overmix.
Spread the batter evenly into the prepared pan. It will be thick. In a small bowl, stir together the topping sugar and cinnamon, then sprinkle it evenly and generously over the entire surface of the batter. If using flaky salt, scatter it lightly over the top as well.
Bake for 26 to 28 minutes, until the top is set and lightly crinkled, the edges are pulling away from the pan, and a toothpick inserted in the center comes out with just a few moist crumbs. The center may look barely set but will firm up as it cools. Do not overbake.
Let the blondies cool in the pan on a wire rack for at least 30 minutes before lifting out using the parchment overhang. Slice into 16 squares with a sharp knife. For the cleanest cuts, chill the pan for 15 minutes before slicing.

Prep: 20 minutes
Bake: 22 to 25 minutes at 325°F (165°C)
Total: 50 minutes

This method is ideal for smaller batches using a 7-inch or 8-inch round or square air fryer-safe pan. The circulating heat creates wonderfully set edges with a particularly fudgy center.

Halve all ingredient quantities to make a half batch, which fits a 7-inch or 8-inch round cake pan or a foil pan that fits your air fryer basket. Grease and line the pan with parchment as described in the oven method.
Follow the same brown butter process on the stovetop, then make the batter exactly as described in steps 2 through 4 of the oven method, using the halved quantities. Spread into the prepared pan and add the cinnamon-sugar topping.
Preheat your air fryer to 325°F (165°C) for 3 minutes. Place the pan in the basket and bake for 22 to 25 minutes. Check at the 20-minute mark. The top should be golden and set, the edges pulling in slightly, and a toothpick in the center should come out with moist crumbs but no wet batter.
If the top is browning too quickly before the center is set, tent loosely with a small piece of foil and continue baking. This is more common in air fryers with strong top elements.
Cool in the pan for at least 25 minutes before slicing. The blondie will firm up considerably as it cools. Cut into 8 to 9 squares.

Prep: 20 minutes
Bake: 60 to 90 seconds on High
Total: 12 minutes

This version is for one generous single-serve blondie made in a large mug or small microwave-safe ramekin. It will be softer and more pudding-like than the oven version, but hits every snickerdoodle flavor note perfectly when you need a fast fix.

In a small microwave-safe mug or ramekin (at least 12-oz capacity), melt 1.5 tablespoons (20g) of butter on High for 20 to 30 seconds. You do not need to brown it here, though swirling it in the hot mug for 30 seconds after melting will deepen the flavor slightly.
Whisk into the melted butter: 2 tablespoons (25g) dark brown sugar, 1 teaspoon granulated sugar, 1 egg yolk (or half a small whole egg), and a small splash of vanilla extract (about 0.25 tsp). Mix until smooth.
Stir in 3 tablespoons (24g) all-purpose flour, a pinch of cream of tartar (about 0.125 tsp), a pinch of baking soda, a pinch of cinnamon, and a pinch of fine sea salt. Mix until just combined.
In a tiny bowl or on a small square of parchment, combine 1 teaspoon granulated sugar with 0.25 teaspoon cinnamon. Sprinkle over the top of the batter in the mug.
Microwave on High for 60 to 90 seconds, checking every 20 seconds after the first minute. The blondie is done when the top looks mostly set but the very center has the slightest jiggle. It will continue to cook from residual heat. Let it sit for 2 minutes before eating directly from the mug. Top with a tiny pinch of flaky salt if desired.

Nutrition Per Serving

Per 1 serving (makes one 9×13-inch pan, cut into 16 bars)

285Calories

40gCarbs

28gSugar

13gFat

3gProtein

Why This Recipe Works

Blondies rely on brown sugar rather than cocoa powder for their deep, caramel-forward flavor, and here we amplify that by also browning the butter first. When butter is heated past the melting point, the water evaporates and the milk solids undergo the Maillard reaction, the same browning process responsible for the flavor of toasted bread, seared meat, and roasted coffee. The result is a nutty, toffee-like complexity that regular melted butter simply does not possess. Using dark brown sugar (which contains more molasses than light brown) doubles down on this depth, and the combination is what makes these blondies taste almost like they contain caramel.

The extra egg yolk is a deliberate choice for texture. Egg yolks are rich in fat and emulsifiers, which produce a fudgier, denser, more cohesive crumb compared to using whole eggs only. The white of a whole egg adds water and protein, which can make baked goods cakier and more open in texture. By adding a yolk without its white, we tip the ratio toward richness and chew. The cream of tartar, borrowed directly from the classic snickerdoodle cookie, serves two purposes here: it lowers the pH of the batter slightly, which inhibits the formation of large sugar crystals and contributes to a chewier, softer texture, and it provides that characteristic mild, tangy note that is the true signature of a snickerdoodle.

If your blondies come out cakey rather than fudgy, the most likely culprits are overbaking or overmixing. Overmixing develops gluten and incorporates air, both of which push the texture toward cake. Fold the dry ingredients in gently and stop as soon as the flour disappears. For overbaking, remember that blondies continue to cook from residual heat after leaving the oven, so pulling them when the center still looks barely set is not a mistake, it is the goal. A toothpick should come out with moist crumbs, not clean.

Baker’s Tips

Use a light-colored saucepan or skillet to brown the butter so you can clearly see the color of the milk solids changing. A dark pan makes it nearly impossible to judge when you are at golden amber versus burnt.
Do not skip scraping every last drop of the browned butter into the bowl, including all the dark flecks at the bottom. Those are concentrated flavor, not burnt residue to discard.
Measure your flour by spooning it into the measuring cup and leveling off, or weigh it. Scooping directly from the bag compacts the flour and can add up to 30 percent more, resulting in dry, dense blondies.
Press the cinnamon-sugar topping lightly into the batter with your fingertips or the back of a spoon before baking. This helps it adhere and creates a better crinkled, crackly crust rather than loose sugar that slides off when you slice.
For perfectly clean, bakery-style cuts, let the blondies cool completely, then refrigerate for 15 minutes before slicing with a sharp chef’s knife wiped clean between each cut.
Line the pan with parchment and leave an overhang on at least two sides. Trying to cut and lift blondies from a pan without parchment is a recipe for frustration.

Variations

White chocolate chip version: Fold 150g (about 1 cup) of white chocolate chips into the batter before spreading. The sweetness of white chocolate pairs beautifully with cinnamon.
Apple pie blondies: Fold in 1 cup of peeled, finely diced apple tossed with 0.5 tsp cinnamon and 1 tbsp brown sugar. Add a pinch of nutmeg and cardamom to the batter for a cozy apple pie flavor.
Nutella swirl: Drop tablespoon-sized dollops of Nutella over the batter after spreading and swirl with a butter knife before adding the cinnamon-sugar topping.
Brown butter cream cheese frosting finish: Whip 115g softened cream cheese with 60g powdered sugar and 0.5 tsp cinnamon, and spread over completely cooled blondies for a snickerdoodle bar with frosting reminiscent of a cinnamon roll.

Troubleshooting & FAQ

My blondies came out cakey and dry instead of fudgy. What went wrong?

There are two likely causes. First, overmixing after adding the flour develops gluten and incorporates air, both of which produce a cake-like texture. Fold the dry ingredients in with a rubber spatula using as few strokes as possible. Second, overbaking is the most common culprit. Blondies should come out of the oven looking slightly underdone in the center. They will firm up to a perfectly fudgy texture as they cool. If a toothpick comes out completely clean, they have been in too long.

The cinnamon-sugar topping just sank into the batter and disappeared. How do I get that crinkly crust?

This usually happens when the batter is too warm or the topping is not pressed in before baking. Let the batter rest in the pan for 3 to 4 minutes before adding the topping so a very light skin forms on the surface. Then sprinkle the cinnamon sugar and gently press it in with your fingertips or the flat bottom of a measuring cup. This anchors it to the surface and allows it to bake into a distinct, crackled crust.

My brown butter went from perfect to burnt very quickly. How do I avoid this?

Brown butter moves through stages fast, especially near the end. Keep the heat at medium rather than medium-high, and once you see the foam starting to subside and smell nuttiness, stand at the stove and watch it closely. Have your heatproof bowl ready right next to the stove. The moment you see the milk solids turn a deep golden amber, pour it immediately. The residual heat in the pan will continue cooking the butter for a few seconds even after you remove it from the heat, so do not wait for a perfect color before acting.

My blondies stuck to the pan and fell apart when I tried to remove them. Help!

This almost always comes down to skipping or under-using the parchment. Always line the pan with parchment paper with at least a 2-inch overhang on two sides, even if you also grease the pan. Additionally, make sure the blondies are fully cooled before attempting to lift them. Warm blondies are fragile and will break. If you are already in this situation, use a thin offset spatula to carefully work under the bars from the edges toward the center.

Can I double the recipe, and how does that affect the bake time?

You can double the recipe to fill two 9×13-inch pans, but do not try to bake double the batter in one pan as the center will never fully set. Bake the two pans side by side on the same oven rack or on two racks, rotating them halfway through. The bake time should remain roughly the same at 26 to 30 minutes, though pans on a lower rack may need an extra 2 to 3 minutes. Check each pan independently with a toothpick.

Storage & Make-Ahead

Storage: Store cut blondies in an airtight container at room temperature for up to 4 days. Place a sheet of parchment between layers to prevent sticking. For longer storage, refrigerate for up to 1 week, though room temperature is best for texture. Freeze individually wrapped bars in an airtight container for up to 3 months. Thaw at room temperature for about 1 hour, or warm gently in a low oven (300°F/150°C) for 5 minutes.
Make-Ahead: The blondies actually improve after resting overnight, as the cinnamon flavor deepens and the texture becomes even fudgier. Bake them up to 2 days ahead and store uncut in the pan (covered tightly) at room temperature, then slice before serving. The brown butter can be made up to 5 days ahead and stored in the refrigerator. Bring it back to room temperature and liquid state before using.