German Chocolate Sheet Cake - cooking recipe

Ingredients

1 (18 1/4 ounce) package German chocolate cake mix
1 large egg
2 egg whites
1 3/4 cups water
vegetable oil cooking spray
1 (14 ounce) can fat-free sweetened condensed milk
1/3 cup sweetened flaked coconut
1/3 cup chopped pecans
1/4 cup margarine, softened
1 (16 ounce) box powdered sugar
1/3 cup unsweetened cocoa
1 teaspoon vanilla extract
3 -4 tablespoons nonfat milk

Preparation

Beat cake mix and next 3 ingredients at medium speed with an electric mixer 3 to 4 minutes or until creamy.
Pour batter into a 15x10\" jellyroll pan coated with cooking spray.
Bake at 350* for 15 minutes.
Combine sweetened condensed milk, coconut and pecans; spread over warm cake.
Broil, on lowest rack in oven, about 2 minutes or until golden.
Remove from oven and cool.
Beat margarine and next 3 ingredients at medium speed with electric mixer until blended; gradually add fat-free milk, beating until smooth.
Spread over cake.