- Place chicken breasts at the bottom of the crock pot. 
- Pour in marinara sauce, chicken broth, and all dry seasonings. 
- Cover and cook on LOW for 4–5 hours (or HIGH for 2.5–3 hours) until chicken is tender. 
- Shred the chicken using two forks directly in the crock pot. 
- Break spaghetti in half and stir it in, making sure it’s fully submerged. 
- Cover again and cook on HIGH for 30–40 minutes until pasta is cooked through. 
- Stir in shredded cheese and cream cheese (if using) until fully melted and creamy. 
- Serve hot with optional garnishes like parsley or Parmesan.