Place the chicken breasts in the bottom of the crockpot.
Pour the heavy cream and chicken broth over the chicken.
Add the Parmesan cheese, minced garlic, 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 baby spinach during the last 20 minutes of cooking.
Serve the chicken with the sauce spooned over the top.