1. Preheat oven to 350 2. Reserve 1 cup of cake mix and set aside. 3. Mix remaining cake with 1/2 cup melted butter and 1 egg. Press mixture lightly into the bottom of a 13x9 baking dish. 4. Mix one jar of pumpkin butter with remaining 2 eggs and milk, and pour over cake mixture in pan. 5. Mix remaining 1 cake mix with flour, sugar, remaining 1/4 cup butter, and cinnamon. Crumble over the top of the pumpkin layer. 6. Bake 30 to 40 minutes, or until golden. 7. Cool to room temperature.