Beat German chocolate cake mix and next 3 ingredients at medium speed with an electric mixer 3 to 4 minutes or until creamy. Pour batter into a 15- x 10-inch 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 an electric mixer until blended; gradually add fat-free milk, beating until smooth. Spread over cake.
Note: For testing purposes only, we used Duncan Hines Moist Deluxe German Chocolate Cake Mix.