Place the chicken breasts at the bottom of the crockpot. Ensure they are evenly spaced.
In a separate bowl, mix the diced tomatoes (with juices), Italian seasoning, chicken broth, minced garlic, salt, and pepper.
Pour the tomato mixture over the chicken in the crockpot, ensuring all pieces are covered.
Cover the crockpot with its lid and cook on low for 6 hours or until the chicken is cooked through and tender.
Once cooked, carefully shred the chicken with two forks while it's still in the crockpot.
Stir in the heavy cream and grated Parmesan cheese until combined and creamy.
Allow it to cook for an additional 15 minutes with the lid on for the cheese to melt thoroughly.
Serve hot, garnished with fresh parsley if desired.