Cheesy Pizza Fondue

1/2 Pound ground beef
1 Medium onion, chopped
2 (15 oz) Cans pizza sauce
1 1/2 Teaspoons basil or oregano
1/4 Teaspoon garlic powder
1 1/2 Cups shredded sharp cheddar cheese
1 Cup shredded mozzarella cheese
Breadsticks

In a heavy saucepan cook beef and onion over medium heat until meat is done; drain. Stir in the pizza sauce, basil and garlic powder; mix well. Reduce heat to low. Add cheeses; stir until melted. Transfer to a small crockpot or fondue pot and keep warm over low heat. Serve with breadsticks.