Place the chicken breast into the slow cooker and season with the italian seasoning, salt, and pepper.
Add the minced garlic, sliced onion, diced tomatoes (undrained), balsamic vinegar, and chicken stock to the slow cooker.
Cover and cook on LOW for 6-8 hours or HIGH for 3-4 hours, or until the chicken is tender and cooked through. (The chicken can be served whole or shredded if desired)
Serve the slow cooker balsamic chicken over pasta or rice, garnish with fresh parsley or basil if desired. Enjoy!
