Three Ingredient Lemon Bars (no photo) 1 package Angel Food Cake Mix 1 package Lemon Pie Filling powdered sugar Mix cake mix and filling together and bake in a 9x13 cake pan at 350 degrees for 20 minutes. Let them cool 5 to 10 minutes. Sprinkle with powder sugar. Cut into servings. ---- Option : use a Lemon Cake Mix instead of Angel food cake mix, and after its done top with cool whip instead of powdered sugar.