Rinse lettuce leaves and pat dry with paper toweling. Tear into large salad bowl.
Drain oranges through sieve over a bowl; reserve 2 tablespoons liquid.
Whisk together sour cream, mayonnaise, salt, black pepper, chili powder, lime juice and reserved 2 tablespoons liquid in small bowl.
Add mandarin oranges, cheese, bacon and onion to salad bowl. Add sour cream mixture; toss to coat. Top with chicken. Serve immediately.
You may substitute 6-ounce package of cooked seasoned strips.