
1 1/2 cups all-purpose flour
3/4 cup cornstarch
4 teaspoons baking powder
1/8 teaspoon salt
8 Tablespoons (1 stick) unsalted butter, softened
1 cup confectioners’ sugar
2 large eggs
1 teaspoon vanilla
1/2 teaspoon lemon or orange extract
1 teaspoons finely grated lemon or orange zest
Preheat oven to 325 degrees F.
Combine the flour, cornstarch, baking powder and salt. Set aside.
Combine the butter and confectioners’ sugar in the bowl of an electric mixer. Beat on low speed with the paddle until well mixed. Increase the speed to medium and continue beating until light, about 2 minutes.
Beat in the eggs one at a time. Batter may look broken and curdled. Beat in the extracts and zest.