PB cake

I'm making this for my nephew's birthday.

PB Cake

18 1/4 ounces yellow cake mix, reduced sugar
1 cup water
2 egg whites
8 tablespoons fat-free margarine
2 tablespoons honey roasted peanut butter
1/2 cup skim milk
2 cups Splenda

Combine cake mix, water and egg whites. Pour into 13x9 pan sprayed with cooking spray. Bake at 350* for 25-30 minutes. While cake is baking, combine margarine, pb, milk and Splenda in a small saucepan and heat until combined. After removing cake from oven, poke with holes and pour pb mixture over cake. Chill 4 hours.
Yield: 16 servings. per serving= 162 Calories; 3g Fat (20.7% calories from fat); 2g Protein; 27g Carbohydrate; 1g Dietary Fiber; trace Cholesterol; 312mg Sodium. Exchanges: 0 Grain(Starch); 0 Lean Meat; 0 Non-Fat Milk; 0 Fat; 0 Other Carbohydrates.