Place the turkey breast in the bottom of the slow cooker.
Add the cream cheese cubes, chicken broth, minced garlic, Italian seasoning, salt, and black pepper on top of the turkey.
Cover and cook on low for 6 hours or until the turkey reaches an internal temperature of 165°F and shreds easily.
Remove the turkey, shred it with two forks, and return it to the slow cooker.
Stir in the sliced roasted red peppers and fresh spinach until the spinach wilts, about 5 minutes.
Sprinkle the parmesan cheese over the top before serving.