Deluxe Pizza Bagels

8oz lean ground beef
6 medium bagels, halved (or lightly toasted English muffins)
1 (14oz) jar pizza sauce
1/4 C chopped onion
1 (4oz) can sliced mushrooms, drained
1 (4oz) can chopped black olives, drained
3/4 C shredded mozzarella cheese
1/2 C shredded cheddar cheese

Preheat oven to 375. Heat medium skillet over medium-high heat. Add beef; cook until brown and crumbly. Drain. Arrange bagels cut-side up on an ungreased baking sheet. Spread pizza sauce over bagels; sprinkle with beef. Divide onion, mushrooms and olives evenly among bagels. Combine cheeses in small bowl. Sprinkle evenly over bagels. Bake until cheese is bubbly, about 10 minutes.