Brown Sugar Shortbread Puffs 1 cup firmly packed brown sugar 1 1/4 cups butter or margarine, softened 1 teaspoon vanilla extract 1 egg yolk 2 1/4 cups all-purpose flour Heat oven to 350 degrees F. In large bowl, beat brown sugar and margarine until light and fluffy. Add vanilla extract and egg yolk; blend well. Add flour; stir until mixture forms a smooth dough. Drop dough by rounded teaspoonsful 2 inches apart onto ungreased cookie sheets. Bake for 10 to 15 minutes or until lightly browned and set.