1 box yellow cake mix
1/2 cup butter or margarine, softened
4-5 Granny Smith apples, pared and sliced
1 cup Sugar
2-3 tsp. cinnamon
1 cup Sour cream
Heat oven to 350 degrees. Cut butter into dry cake mix until crumbly. Pat cake mixture lightly in ungreased oblong pan (9X13 ) building up slight edges. Bake 10 minutes. Remove from oven. Peel, pare then slice apples. Arrange apple slices on warm crust. Mix together about 1 cup sugar and 2-3 teaspoons of cinnamon (more or less depending on size of apples and to taste). Sprinkle on apples. Blend 1 cup of sour cream with 1 egg and drizzle over apples. Bake 25 minutes or until edges are light brown. Do not over bake.