Grease bottom only of 13 x 9 inch bake pan. Reserve 1 cup cake mix for topping. Combine remaining cake mix with butter and egg. Press into bottom of pan. Prepare filling. Combine pumpkin, pie spice, sugar, egg and milk and mix until smooth. Pour over crust. For topping, combine reserved cake mix, melted butter, brown sugar, and cinnamon and sprinkle over filling. Bake at 350 degrees for 45 to 50 minutes or longer until a knife inserted comes out clean. Serve with whipped topping.
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