Pumpkin Pie Cake

1 (18.5 ounce) box yellow cake mix
1 egg
1/2 cup butter, melted
1 (29 ounce) can pumpkin puree
2 eggs
1 teaspoon ground nutmeg
1 teaspoon ground cinnamon
1/2 cup granulated sugar
2/3 cup evaporated milk
3/4 cup granulated sugar
1/2 cup butter, softened

Preheat oven to 350 degrees F (175 degrees C).

Set aside 1 cup cake mix for the topping. Combine remaining cake mix, the 1 egg, and melted butter or margarine. Pat into a 9 x 13-inch baking pan.

In a large bowl, mix pumpkin, the 2 eggs, spices, the 1/2 cup sugar and milk. Pour pumpkin mixture over the cake mix crust.

In a small bowl, combine reserved 1 cup cake mix and the 3/4 cup sugar. Cut in the 1/2 cup softened butter until mixture resembles coarse crumbs. Sprinkle mixture on top of pumpkin mixture. Bake at 350 degrees F (175 degrees C) for 55 minutes.