For cooks who are long on good taste and short on time, Karen A. Levin, author of The Twenty-Minute Low-Fat Gourmet and other titles, offers 85 delectable one-dish entrees that can be prepared and on the table in just 20 minutes. Recipes include Szechwan Chicken, Steak Diane with Asparagus and Mushrooms, and Tuscan Grilled Dinner.