Preheat broiler.
Cut bell peppers into quarters; discard stems and seeds. Place peppers, skin-side up, on foil-lined baking sheet. Broil 3 inches from heat for 10 minutes or until skin is blackened. Wrap peppers in foil from baking sheet; let stand 10 minutes. Peel off and discard skin.
Spread 4 bread slices with mayonnaise. Top with lettuce, turkey, onion and basil, if desired. Arrange peppers over basil; top with remaining bread slices.
This recipe yields 4 servings.
Exchanges Per Serving: 2 Starch, 3 Meat.
Nutrition Facts: Calories 282; Calories from fat 19%; Total Fat 7g; Saturated Fat 1g; Protein 27g; Carbohydrates 37g; Cholesterol 47mg; Sodium 282mg; Dietary Fiber 7g.