1. Preheat broiler.
2. Place bagel halves, cut sides up, on a baking sheet. Broil 2 minutes or until lightly toasted.
3. Spread 2 tablespoons marinara on cut side of each bagel half. Top each half with 1/4 cup chicken, and sprinkle with 1/4 cup cheese. Broil bagel halves an additional 2 minutes or until cheese melts.