Trish's Pumpkin Pie Cake

Pumpkin pie Cake1
box yellow cake mix, remove 1 cup for topping1 stick melted margarine1 beaten egg1 large can (29 oz) pumpkin3 eggs1/2 cup brown sugar1/2 cup white sugar1 1/2 tsp. cinnamon1 cup milkIn large bowl place cake mix (minus the 1 cup reserved for topping); add melted margarine and beaten egg. Mix with fork until cake mix is absorbed. Press into a 9x13 inch cake pan, sprayed with Pam.FILLING:In same large bowl mix pumplin with remaining ingredients. Beat well and spread over cake dough.TOPPING:To cup of cake mix reserved, add 1/2 stick margarine, 1/2 cup sugar and 1/2 cup chopped nuts. Mix well and sprinkle over pumpkin mixture. Bake at 350 for 1 hour and 10 minutes or until knife inserted in middle comes out clean.