Egg Yolk Paint
["1 egg yolk", "1/4 tsp. water", "food color", "1 batch uncooked cut sugar cookies"]
["Mix egg yolk and water.", "Divide mixture among several small cups.", "Tint each with different food color to make bright colors. If paint thickens, stir in a few drops of water.", "Paint your cookies with a small paint brush.", "Then bake your cookies."]
["egg yolk", "water", "food color", "batch"]