Cheese Steak Skillet

2 cups sliced green bell peppers
1 small onion, thinly sliced
1 tablespoon olive oil
1 pound cubed steak, cut into serving pieces
1 (26 ounce) can four-cheese spaghetti sauce
1/2 cup steak sauce
6 ounces thinly sliced mozzarella cheese

Brown peppers and onion in hot oil; add steak and brown on both sides. Add and mix spaghetti sauce and steak sauce. Simmer, covered, for 5 minutes until sauce is bubbly. Top with mozzarella cheese; continue to simmer until cheese is melted.