The season of sweets and treats is about to begin. And we're looking for your favorite holiday cookie recipes. We'll print a baker's dozen of the best cookies in December. Please send typed or printed recipes with your name, address and phone number by Oct. 28 to: Suzanne Loudermilk, Food Editor, The Sun, 501 N. Calvert St., Baltimore, Md. 21278, or fax entries to 410-783-2519.