Place pizza crust directly on oven rack; bake 7 to 8 minutes or until slightly crisp.
Preheat large saute pan on medium-high heat. Add ground beef, pepper and seasoned salt; stir and cook 5 to 7 minutes or until crumbled and no longer pink. Stir in steak sauce; remove meat from pan.
Place butter in saute pan, then add onions, caraway seeds and Worcestershire sauce. Cook 8 to 10 minutes or until soft and well-browned.
Place pizza crust on baking sheet. Combine Italian blend cheese and salad dressing; spread over crust. Spread meat over cheese, then top with cooked onions. Top with Cheddar cheese slices and bake 4 to 5 minutes or until cheese is nicely melted.