Step 1

Preheat oven to 350°F.

Step 2

In a medium bowl, mix the flour, butter, and powdered sugar until well combined. Press into an ungreased 8x8x2-inch or 9x9x2-inch baking pan, building up the edges about half an inch.

Step 3

Bake the crust for 20 minutes.

Step 4

Beat the filling ingredients with an electric mixer on HIGH speed for about 3 minutes or until the mixture is light and fluffy. Pour the mixture over the hot crust.

Step 5

Bake for 25-30 minutes or until no indentation remains when the center is lightly touched. Cool in the pan on a wire rack.

Step 6

Just before serving, dust with powdered sugar, if desired. Cut into 1½-2-inch bars.