Pizza Fondue

1 pound ground beef
1 chopped onion
1 Tablespoon cornstarch
¼ teaspoon garlic powder
20 ounces pizza sauce
1 cup grated cheddar cheese
1 cup grated mozzarella cheese
1 loaf French bread, cubed

Cook and stir beef and onion together until done. Stir in cornstarch and garlic powder. Add pizza sauce. Heat to boiling. Reduce heat and add cheeses, stir until melted. Serve in fondue pot with cubed French bread... toasted if desired.