Fudge Ripple Cup Cake

I did not try this as I could not find one ingredient. Did you know their is no dry frosting mix anymore in the stores, at least not here. I sooo wanted to try this one.

Fudge Ripple Cup cakes
Mr. Bill Smith

1 package yellow cake mix ( 1 pound 3-oz size)
1 1/2 cup water
2 eggs
1 package butter cream fudge frosting ( 12 1/4-oz size)
3 Tablespoon butter or margarine
3 Tablespoons lukewarm water

Combine cake mix, water and eggs. Prepare according to package directions. Spoon batter into cupcake liners, filling each liner 1/4 full with batter. Measure cup of dry frosting mix. Sprinkle over batter in each cup. Pour in remaining batter, filling each cup slightly more then 1/2 full. Bake 20 minutes at 350 degrees . Add butter and water to remaining frosting mix. Blend until smooth and creamy. Frost cooled cup cakes. Makes 30 to 36 cup cakes.