Place the chicken breasts at the bottom of the crock pot. Pour in the chicken broth and add the diced tomatoes with their juices.
Add the diced onion, minced garlic, dried basil, oregano, crushed red pepper flakes, salt, and pepper. Cover and cook on low for 6-8 hours or high for 3-4 hours.
Once cooking time is up, remove the chicken and shred it. Return the shredded chicken to the pot.
Stir in the heavy cream and grated Parmesan cheese until well combined.
Add the pasta directly into the crock pot and cook for an additional 15-20 minutes until the pasta is tender. Adjust seasoning if needed.
Garnish with fresh basil or parsley before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.