Cream 1 c. Butter, 2c. Flour and 1/2 c. Powdered sugar together and press into a 13"x9" pan to form crust.
Bake at 350* for 15-20 minutes. Filling- Mix together all other ingredience to make filling. Use real lemon juice. Pour over shell. Bake again at 350* for 20-25 minutes. Cool completely, sprinkle with powdered sugar. Cut into small squares.