Creamy Pizza Fondue

1/2 pound Ground round (85% lean)
1 Small onion chopped
1 tablespoon Melted butter or olive oil
2 cans (10 oz.) pizza sauce
1 tablespoon Cornstarch
2 teaspoons Dried oregano
1/2 teaspoon Garlic powder
2 1/2 cups Shredded Cheddar cheese (about 10 ounces)
1 cup Shredded mozzarella cheese (about 4 ounces)

1. In a large frying pan, cook ground beef and onion in butter over medium heat, stirring to break up lumps of meat, until beef is browned and onion is softened, 5 to 7 minutes. 2. In a medium bowl, combine pizza sauce, cornstarch, oregano, and garlic powder.
Stir until well mixed.
Add to ground beef mixture in pan and cook, stirring occasionally, until mixture thickens and bubbles, 5 to 7 minutes. 3. Reduce heat to low and add cheese, a third at a time, stirring well after each addition. Transfer to a chafing dish or fondue pot.