1. Crumble ground beef into 3-quart casserole. Add bell pepper, onion and garlic. Cover tightly and microwave on high 6 to 9 minutes, breaking up beef and stirring after 4 minutes, until beef is no longer pink.
2. Stir in remaining ingredients. Cover tightly and microwave 12 to 18 minutes, stirring every 6 minutes, until boiling.