Brown Sugar Shortbread Puffs
["1 c. firmly packed brown sugar", "1 1/4 c. margarine or butter, softened", "1 tsp. vanilla", "1 egg yolk", "2 1/4 c. all-purpose flour"]
["Heat oven to 350\u00b0.", "In a large bowl, beat brown sugar and margarine until light and fluffy.", "Add vanilla and egg yolk; blend well. Add flour. Stir until mixture forms a smooth dough. Drop dough by rounded teaspoonfuls 2-inches apart onto ungreased cookie sheets.", "Bake at 350\u00b0 for 10 to 15 minutes or until lightly brown and set.", "Yields 4 dozen cookies."]
["brown sugar", "margarine", "vanilla", "egg yolk", "all-purpose"]