2 3/4 cups (352 g) all-purpose flour, spooned and leveled
2 teaspoons cream of tartar, sifted
1 1/4 teaspoons fine sea salt
1 teaspoon baking soda
1 teaspoon ground cinnamon (Shauna Sever recommends Vietnamese cinnamon)
1 cup (225 g) unsalted butter, at room temperature
3/4 cup (170 g) light brown sugar
3/4 cup (150 g) granulated sugar
1 1/2 teaspoons vanilla extract
2 large eggs, room temperature
1/4 cup (57 g) whole milk
3/4 cup (170 g) unsalted butter, room temperature
1 1/2 cups (180 g) powdered sugar
1 teaspoon ground cinnamon, plus more for dusting (optional)
1 tablespoon plus 1 teaspoon whole milk
1 teaspoon pure vanilla extract
1/4 teaspoon fine sea salt


1.Prep the pan and the oven Position a rack in the center of the oven and preheat it to 325°F. Line a 9x13 light-colored metal baking pan with aluminum foil and spray it with nonstick cooking spray.
2.Whisk together the dry ingredients In a medium bowl, whisk together the flour, cream of tartar, salt, baking soda, and cinnamon.
3.Make the batter In the bowl of an electric mixer fitted with the paddle attachment, beat the butter on medium speed until creamy. Add the brown and granulated sugar and vanilla and beat until light and fluffy, about 3 minutes. Beat in the eggs, one at a time, giving each about 30 seconds of beating to fully incorporate. Beat in the milk. Reduce the speed to low and gradually beat in the flour mixture. Finish stirring the batter by hand to make sure every bit is incorporated.
4.Bake the bars Spread the batter in the prepared pan and smooth the top. Bake for 25 to 30 minutes, or until the top looks puffy and begins to turn golden. Rotate the pan 180 degrees, and while doing so, rap the pan on the oven rack until the bars deflate. Bake for 5 minutes more, or until the bars have pulled away from the sides of the pan and a toothpick inserted into the center comes out clean. The bars will still look quite soft. If they’ve puffed back up during the last minutes of baking, rap the pan on the countertop once again.
5.Let cool completely in the pan set on a wire rack
6.Make the frosting In the bowl of an electric mixer fitted with the paddle attachment, beat the butter on medium speed until creamy. Add the powdered sugar, cinnamon, milk, vanilla, and salt, and beat until smooth. Raise the mixer speed to high and beat until very light and fluffy, about 2 minutes.
7.Frost the bars Spread the frosting over the cooled bars. Lightly dust cinnamon over the entire pan, if you wish. Store leftovers covered in the refrigerator for up to 5 days.

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