For serving: tortillas, diced onions, chopped cilantro, crumbed feta or cotija cheese, lime slice
Place the chicken breasts in the slow cooker.
Add the tomatoes, onion, peppers, garlic, taco seasoning and salt to a blender. Pulse 3 to 5 times. Then pour over the chicken. Cook on low for 4 to 6 hours, or until you are able to shred the chicken. Shred and then cook an additional 15 to 30 minutes. Place slow cooker on warm until ready to serve.
For the feta crema, stir the cream cheese, feta and lemon juice until smooth. Add milk to crema sauce as needed to thin it out.
Serve the chicken inside of tortillas. Add your favorite toppings such as, onion, cilantro and feta cheese.