Creamy Apple Squares-Peggy

1 package Pillsbury Plus yellow cake mix

1/2 cup butter or margarine

1/2 cup firmly packed brown sugar

1/4 teaspoon cinnamon

4 thinly sliced apples

1 cup sour cream

2 eggs

Preheat oven to 350 degrees. Combine the first 2 ingredients. Mix until crumbly. Reserve 2/3 cup for topping. Add sugar and cinnamon to topping mix and set aside. Press remaining ingredients itno bottom of ungreased 9x13 inch pan. Arrange apple slices over crust. Blend sour cream and egg; pour over apples. Sprinkle reserved topping over all. Bake 30 minutes until golden brown and bubbly.