Gooey Chocolate Icing Be The First To Review By Anonymous recipe Comments | 1 Favorites | 274 Print 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.