Marble Fluff Cake

1 pkg. Pillsbury Plus White Cake Mix

1-1/2 C vanilla ice cream

1/2 C water

3 oz. pkg. Cream cheese, softened

3 egg whites

1 sq. (1 oz.) semi-sweet or unsweetened Hershey's baking chocolate, melted, or 1 oz. pre-melted unsweetened baking chocolate flavor

Frosting:

2 C powdered sugar

2 T margarine or butter, softened

1 t McCormick or Schilling Pure Vanilla Extract

3 oz. cream cheese, softened

3 to 4 t milk

Heat oven to 350. Grease and flour 13x9" pan. Blend cake mix, ice cream, water, cream cheese and egg whites. Beat 2 minutes at highest speed. Pour 1-1/4 C batter into small bowl. Pour remaining batter into prepared pan. To reserved batter, add melted chocolate; blend well. Spoon over batter in pan. With a knife, marble batter using a swirling motion. Bake for 30-40 minutes or until toothpick inserted in center comes out clean. Cool. Combine frosting ingredients; blend at low speed until smooth. Spread over cooled cake. 12-15 servings. High altitude, above 3500 feet: Add 3 T flour to dry cake mix. Increase water to 2/3 C. Bake at 375 for 35-45 minutes.