Mix egg and melted margarine with a fork into cake mix until well blended. Press into bottom of a 9 x 13 pan with your hands. Make pumpkin pie filling for a 9 inch pie, and pour over dough.
Mix together the first 3 ingredients and cut in the margarine. Sprinkle over the top of the filling. Bake at 350 degrees for 45 to 50 minutes. Cake is done when a knife is inserted and comes out clean.