Citrus Bars - cooking recipe

Ingredients

1 cup all-purpose flour
1/3 cup nonfat sour cream
3 tablespoons powdered sugar
3 tablespoons unsalted butter, room temperature
3 eggs
3 egg whites
1/2 cup orange juice
1/2 cup lemon juice
1 tablespoon lemon zest, grated
1/4 teaspoon baking powder
1 1/2 cups powdered sugar (again)

Preparation

Preheat oven to 325 degrees F.
Line 9\" square baking pan with enough foil to overhang sides by 2\", then coat with cooking spray.
At medium speed, beat flour, sour cream, 3 tablespoons powdered sugar & butter until combined.
Press dough onto bottom of pan, & prick with fork.
Bake 20 minutes or until lightly browned.
At low speed, beat eggs, whites, juices, zest, baking powder & 1 1/2 cups powdered sugar until combined.
Pour over warm crust.
Bake 40 minutes or until set.
Cool on wire rack, & if desired, sprinkle with additional powdered sugar before cutting into bars.