Combine mayonnaise, lime juice, and chili powder. Stir in avocado, celery, tomatoes, bacon strips, and walnuts. Spoon scant 1/4 cup salad into center of each lettuce leaf. Wrap leaf around salad. Secure with wooden pick. Serve immediately. Helpful HintsShop for avocados that are firm, yet ripe when you're planning on chopping them. It's easiest to first halve the avocados, then remove the pit and peel them. Soft lettuce leaves, such as Bibb, Boston, or leaf lettuces, work best in wraps, Crisper salad greens are harder to roll.®, ™, © 2009 Kellogg NA Co Morningstar Farms® Recipes are the property of the Kellogg Company.