Place the chicken breasts in the bottom of the slow cooker.
Pour the heavy cream and chicken broth over the chicken.
Add the minced garlic, Parmesan cheese, sun-dried tomatoes, Italian seasoning, salt, and black pepper.
Stir gently to combine the sauce ingredients around the chicken.
Cover and cook on low for 6 hours.
Stir in the fresh spinach during the last 15 minutes of cooking until it wilts.