1. In a large skillet over medium-high heat, heat oil; saute sausage and onion 6 to 8 minutes, or until browned, breaking up sausage into smaller pieces.
2. In a 2-quart or larger slow cooker, combine sauce, green pepper, Parmesan cheese, garlic, and salt. Add sausage mixture and mix well.
3. Cover and cook on low 4 hours. When ready to serve, stir in mozzarella cheese.
Recipe and Image from the Mr. Food Test Kitchen
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