1Heat oven to 350ºF. Crush cereal.* In medium bowl, mix cereal and tomato puree; let stand 5 minutes.
2Cut bell peppers lengthwise in half; remove seeds and membranes. Place peppers, cut sides up, in 13x9-inch (3-quart) glass baking dish.
3In 10-inch skillet, cook beef and onion over medium heat, stirring occasionally, until beef is brown; drain. Stir in cereal mixture and remaining ingredients except cheese. Divide beef mixture evenly among peppers.
4Cover; bake 40 to 45 minutes or until peppers are tender. Sprinkle each pepper half with 1/2 tablespoon cheese; let stand 5 minutes.