Transfer onions and garlic to slow cooker, add chicken, crushed tomatoes, tomato sauce, chicken broth, Italian seasoning, basil, oregano, salt, and pepper. Mix well.
Cover and cook on LOW for 6-8 hours or HIGH for 3-4 hours.
Shred chicken and return to slow cooker.
Add heavy cream, mozzarella, and Parmesan. Stir until melted.
Add pasta and cook on HIGH for 15-20 minutes until al dente.
Serve and garnish with fresh basil and extra Parmesan.
Notes
Notes
For a vegetarian option, replace chicken with hearty vegetables and use vegetable broth. Cook the pasta separately if storing leftovers.