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.