Tart Lemon Squares - cooking recipe

Ingredients

1 c. flour
1/3 c. sifted powdered sugar
1/4 c. plus 1 Tbsp. chilled margarine, cut into small pieces
vegetable cooking spray
1 c. sugar
2 Tbsp. flour
1 1/2 tsp. grated lemon rind
1/2 tsp. baking powder
1/4 tsp. salt
3 egg whites
1 egg
7 Tbsp. fresh lemon juice
1/4 tsp. butter flavoring
2 Tbsp. powdered sugar

Preparation

Combine 1 c. flour and 1/3 c. powdered sugar in a bowl; cut in margarine with a pastry blender until mixture resembles coarse meal.
Press mixture firmly and evenly into the bottom of an 11 x 7 baking dish coated with cooking spray.
Bake at 350\u00b0 for 20 minutes or until lightly browned.