1Heat oven to 400°. Mix beef, bread crumbs, oregano, salt and egg. Press mixture evenly against bottom and side of ungreased pie plate, 9x1 1/4 inches.
2Sprinkle mushrooms, bell pepper, pepperoni and olives into beef-lined plate. Pour spaghetti sauce over toppings.
3Bake uncovered about 25 minutes or until beef is no longer pink in center and juice is clear; carefully drain. Sprinkle with cheese. Bake about 5 minutes longer or until cheese is light brown. Let stand 5 minutes before cutting.