Season both chicken breasts generously with Italian seasoning, making sure to coat all sides.
Place the seasoned chicken in a slow cooker and add the chicken broth, sun-dried tomatoes, and garlic.
Cover and cook on LOW for 3 hours or HIGH for 2 hours, or until the chicken is cooked through and tender.
Using two forks, shred the chicken directly in the slow cooker.
Add the remaining ingredients and stir to combine.
Allow the chicken and sauce to cook for about 10 minutes, or until the spinach has wilted and everything is heated through.
Give everything a good stir before serving.
Serve over your favorite pasta and enjoy!