In a large skillet, cook the beef, green pepper if desired, onion and mushrooms over medium heat until meat is no longer pink, breaking meat into crumbles; drain. Add pizza sauce and basil. , Transfer to a greased 3-qt. or 13x9-in. baking dish. Top with mozzarella cheese and potatoes. Bake, uncovered, at 400° until potatoes are lightly browned, 30-35 minutes., Sprinkle with cheddar cheese; bake until cheese is melted, about 5 minutes.