Snickerdoodle Bars

2 2/3 cups flour
2 tsp baking powder
1 tsp kosher salt
2 cups packed brown sugar
1 cup unsalted butter, at room temperature
1 T vanilla
2 T sugar
2 tsp cinnamon

Preheat oven to 350. Lightly grease a 9x13 pan. Sift together flour, baking powder, and salt and set aside. In large bowl, beat together butter, sugar, egg and vanilla until smooth. Stir in the flour mixture until well blended. Spread evenly in prepared pan (mixture will be somewhat like cookie batter). Combine white sugar and cinnamon in a little bowl. Evenly sprinkle cinnamon sugar mixture over the top of the batter. Bake 25-30 minutes or until surface springs back when gently pressed. Cool slightly. While still warm, cut into bars with a sharp knife.