Instructions: Heat oven to 350 degrees. Mix cake mix (dry), margarine, brown sugar and cinnamon until crumbly. Reserve 2/3 cup crumbly mixture. Press remaining crumbly mixture in bottom of ungreased rectangular pan, 13x9x2-inches.

Arrange apple slices on mixture in pan. Beat sour cream and egg until blended; spread over apples. Sprinkle with reserved crumbly mixture. Bake 25 to 30 minutes or until topping is light golden brown; cool.

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