1 c. butter, softened
2 c. plus 1 tbsp. flour
1/2 c. confectioners sugar
4 eggs
2 c. sugar
6 tbsp. lemon juice
1/2 tsp. baking powder

Preheat oven to 325 degrees. In medium bowl combine butter, 2 cups flour, and confectioners sugar until well blended. Pat mixture evenly into a 13x9 baking pan. Bake 15 minutes.

While that is baking, beat eggs slightly, then add sugar, lemon juice, remaining 1 tablespoons flour, and baking powder; mix well. Pour egg mixture over baked crust; return to oven and bake 40-45 minutes. Sprinkle with additional powdered sugar and cut into squares.