Wash and prepare mushrooms, onion and bell pepper.
Combine vegetables, crushed tomatoes, Italian seasoning, broth and tomato paste in slow cooker.
In a bowl, mix ground pork with salt and pepper. Shape pork into marble sized balls..
Gently stir meatballs into soup mixture. Cover and cook on LOW for 6-7 hours.
Serve in bowls. Top with shredded cheese (optional).
