Variation: Frosted Heart Cookies: Omit preparation of egg yolk paint and painting of cookies before baking. Bake cookies as directed. Frost cooled cookies with Powdered Sugar Glaze. Let stand on cooling rack 6 hours or until dry. To paint, place small amounts of paste color on a piece of waxed paper or small amounts of liquid food color in small cups. If using paste colors, dip small brush in water and then in paste color. Paint designs onto frosted cookies, painting largest part of design first. When using more than one color on a cookie, let each color dry before adding another color.