BUTTERCREAM FROSTED SUGAR COOKIE BARS YIELD: 16 Bars 1 ⅔ cups all purpose flour-210 grams ¾ teaspoon baking powder Heaping ½ teaspoon fine salt ½ cup unsalted butter, softened ½ cup plus 2 Tablespoons white sugar-130 grams 3 Tablespoons brown sugar, packed-40 grams 1 teaspoon lemon or orange zest 1 large egg, room temp 1.5…
