Spray counter lightly with non-stick cooking spray. Combine rolls together and roll into a 13-inch circle. Place on a sprayed 12-inch pizza pan. Poke several times with a fork to prevent bubbles from forming.
Pre-bake at 350°F 5-10 minutes.
Brown ground beef and drain well. Add onion and cook until tender. Add soup, ketchup and mustard and let simmer 5-10 minutes.
Spread meat mixture over pre-baked crust. Top with cheeses and bake an additional 5-10 minutes or until cheese is nicely melted.