Chocolate Eclair Cake | Plain Chicken - here's a quick and easy recipe for homemade chocolate icing that I like to use on this: 1 stick butter, 1/4 cup milk, 1 cup sugar, 1/3 cup cocoa, 1 tsp. vanilla. Put all in saucepan; once butter is melted, bring to a boil, stirring constantly. Remove from heat; cool. Pour over top of dessert; refrigerate for 12 hours.