Several factors could be causing your cookies to spread: • Using too much grease on the cookie sheet. Grease sheets lightly or use parchment paper instead. • Using warm cookie sheets. Be sure to cool sheets to room temperature between batches. • Substituting butter in cookie recipes that call for shortening. Try half butter and half shortening to achieve a better result. • Making cookies too big. Try making smaller-size cookies. • Using warm cookie dough. Refrigerate -- or even freeze -- dough balls before baking.