In a medium-size bowl, combine chicken, red pepper, cucumber, mango and green onion. Stir in yogurt, salt, pepper and lime juice until well combined. Sprinkle with cilantro and toss to combine.
Slice bagel in half horizontally. Arrange lettuce over cut side of bottom half. Top with chicken salad mixture. Cover with top half of bagel.
Per serving: about 450 calories, 38 g protein, 7.5 g total fat, 1.3 g saturated fat, 58 g carbohydrates, 7 g fibre, 65 mg cholesterol, 1100 mg sodium % RDI: 12% calcium, 16% iron, 80% vitamin A, 140% vitamin C