PUMPKIN SPICE CAKE

1 box (18.25 ounces) spice cake mix
1 can (15 ounces) pumpkin
1 can (15 ounces) cream cheese or vanilla frosting
1/2 cup chopped walnuts

Prepare cake pan according to cake mix package directions. Thoroughly mix together cake mix and pumpkin either using a spoon or a mixer on low speed. Bake according to cake mix package directions. Cool completely. Frost with frosting. Sprinkle walnuts over the top. Serves 12 to 24.