Gooey Chocolate Icing Be The First To Review By Anonymous recipe The yummiest chocolate icing ever. Because of its gooey nature, this icing is not meant for layer cakes, but sheet cakes only. Easy, too! Gooey Chocolate Icing Ingredients 1 (14 ounce) can sweetened condensed milk1 tablespoon water1/8 teaspoon salt2 (1 ounce) squares unsweetened chocolate1/2 teaspoon vanilla extract Instructions 1 In a double boiler, combine milk, water, salt and chocolate. Heat, stirring constantly until thick. Remove from heat and allow to cool. Add vanilla. 2 Spread or drizzle over your cake.