1 box yellow cake mix, (less one cup, set aside)
1 stick melted butter
1 beaten egg

Filling:

1/2 c. brown sugar
1/4 c. white sugar
3 eggs
1/2 tsp. cinnamon

Topping:

1 c. saved cake mix
1/2 c. white sugar
1/2 c. chopped nuts (optional)
1 stick butter

Mix cake mix, melted butter and eggs with a fork until moist. Press into a 9x13 pan. For the filling, in a bowl combine pumpkin, brown and white sugar, eggs and cinnamon, beat with a mixer. Spread over cake dough. To make the topping, combine dry ingredients in a bowl, add softened butter and crumb with hands. Sprinkle over top.

Bake 50 minutes at 350. Top with whip cream.