Lemon Squares

This recipe is from one of my mom's best friend's, Valerie Nichols. I have many wonderful memories of her from my childhood.

2 cups flour
1/2 cup powdered sugar
2 cups sugar
1/4 tsp. salt
1 cup margarine
4 eggs
1/2 tsp. baking powder
1/4 cup lemon juice

Combine flour, powdered sugar and margarine. Work together like a pie dough. Press into ungreased 9x13 pan. Bake 15-20 minutes at 350 degrees, till light brown. Beat eggs, sugar, lemon juice, baking powder and salt. Pour over baked crust. Bake 20 minutes more. Sprinkle powdered sugar on top.