Place the chicken breasts in the bottom of the slow cooker and season them with salt and pepper.
In a mixing bowl, stir together the heavy cream, chicken broth, Parmesan cheese, minced garlic, and Italian seasoning until smooth.
Pour the cream mixture over the chicken. Add the chopped sun-dried tomatoes on top.
Cover and cook on low for 5 to 6 hours or until the chicken reaches an internal temperature of 165 degrees.
Stir in the fresh spinach during the last 15 minutes of cooking so it wilts but keeps its color.
Serve the chicken with the sauce spooned over the top.