Mom's Fancy Cake

1 box cake mix, any flavor
1 box (3 3/4 oz) instant pudding mix, any flavor
1/2 c. melted margarine or butter
1 c. hot water
4 eggs

Combine all ingredients on medium speed for 5 minutes. Pour in sprayed Bundt or angel food cake pan. Bake at 350 degrees for 40-45 minutes. Cool in pan 10-15 minutes. Invert onto plate. Sprinkle confectioners sugar over cooled cake. Serve.