Saute a pound of ground beef and drain excess fat. Saute minced bell pepper, onion, and garlic. Add a 28-oz. can of crushed tomatoes, Italian seasoning, and salt and pepper. Simmer everything together for 15-20 minutes, adding more water as needed. Stir in a pound of gnocchi (no need to pre-cook). Transfer everything to a 9x13 pan. Sprinkle with whole-milk shredded mozzarella and grated Parmesan. Bake 30 minutes at 425 degrees. Let sit 10 minutes before serving.