1 pkg. lemon cake mix
1/2 c. softened butter
1 1/2 c. sugar
1 tsp. baking powder
4 eggs
1/2 c. lemon juice
1/4 c. flour

Mix cake mix and butter like pie crust; pat onto a cookie sheet. Bake at 350 degrees for 15 to 20 minutes. While crust is baking, prepare filling. Mix the rest of the ingredients with the mixer and spread over baked crust. Return to oven for 20 to 25 minutes more. Cool, dust with powdered sugar (if desired) and cut into bars.