This recipe for slow cooker chicken fajitas is a healthy and flavorful meal that is perfect for busy weeknights. Simply add chicken breasts, sliced bell peppers and onions, and fajita seasoning to your crock pot and let it cook on low for 6-8 hours. Once the chicken is cooked, shred it with a fork and serve with warm tortillas and your favorite toppings like avocado, salsa, and sour cream.