Ingredients
1 cup unsalted butter, softened
1 1⁄4 cups granulated sugar, divided
1⁄2 cup packed light brown sugar
2 large eggs, at room temperature
1 1⁄2 teaspoons vanilla extract
2 1⁄4 cups (270g) all-purpose flour
2 teaspoons cornstarch
1 teaspoon baking powder
1 teaspoon cream of tartar
2 1⁄2 teaspoons cinnamon, divided
1⁄2 teaspoon salt
Preparation
Step 1
Preheat the oven to 350°F. Line an 8×8-inch baking pan with parchment paper, leaving an overhang on the sides.
Step 2
In a large bowl, beat the butter with 1 cup of granulated sugar and the brown sugar with an electric mixer on medium speed until light and fluffy, 2-3 minutes. Beat in the eggs one at a time, then mix in the vanilla extract.
Step 3
In a separate bowl, whisk the flour, cornstarch, baking powder, cream of tartar, 1 teaspoon of cinnamon, and salt. Add the dry ingredients to the wet and mix gently by hand until just combined. Press the dough into the prepared pan.
Step 4
In a small bowl, mix the remaining 1/4 cup granulated sugar and 1 1/2 teaspoons of cinnamon. Sprinkle evenly over the dough in the pan.
Step 5
Bake on the center rack for 25-30 minutes, until the edges are lightly browned and a toothpick inserted into the center comes out mostly clean.
Step 6
Let the bars cool completely in the pan on a wire rack. Then, use the parchment paper to lift the bars out of the pan and slice them into squares. Enjoy!
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