Pizza Fondue

1 onion, chopped
1/2 pound ground beef
2 (10 1/2-oz) cans pizza sauce
1 tablespoon cornstarch
1 1/2 teaspoons fennel seed
1 1/2 teaspoons oregano
1/4 teaspoon garlic powder
10 oz grated cheddar cheese
1 cup grated mozzarella cheese

Brown onion and ground beef in a large sauce pan. Mix pizza sauce and cornstarch together and add to meat. Add fennel seed, oregano and garlic powder. Just before serving, add cheddar and mozzarella cheeses. Stir over medium heat until cheeses are melted. Pour into fondue pot. Serve with garlic bread cubes or French bread cubes.