The Best Snickerdoodle Bars

Soft, cinnamon-swirled snickerdoodle bars baked in an 8×8 pan for easy slicing and sharing.

Prep Time5

Cook Time25

Total Time45

Servings: 1 servings

Preheat the oven to 350°F (175°C). Line an 8×8-inch baking pan with aluminum foil and lightly spray the foil with cooking spray; set the pan aside.
In a large microwave-safe bowl, melt the 1/2 cup melted butter in the microwave (about 1 minute). Let it cool briefly so it is warm but not hot.
Add the large egg, 1/2 cup granulated sugar, 1/3 cup packed light brown sugar, and 1 teaspoon vanilla extract to the butter and whisk until smooth.
Stir in 1 cup all-purpose flour, 1/4 teaspoon cream of tartar, and 1/4 teaspoon salt (if using) until just combined; do not overmix.
Spread the batter evenly into the prepared pan and smooth the top with a spatula.
In a small bowl, combine 1/4 cup granulated sugar and 2 teaspoons ground cinnamon and stir to blend.
Evenly sprinkle the cinnamon-sugar mixture over the batter, using a small spoon to distribute it across the surface.
Bake for 24 to 25 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs but no wet batter.
Remove the pan from the oven and place it on a wire rack to cool for at least 15 minutes before lifting the foil and slicing into 9 to 12 generous squares.