Slice onion. Add butter to a skillet. Add the onion and saute over medium heat for 5-6 minutes. Put onions in the bottom of your crockpot.
Stir spices into the onion and add chicken. Top with salsa. Cook on low for 6-8 hours.
Prepare toppings by cutting vegetables into bite-sized pieces.
Shred chicken and serve on top of tortillas with desired toppings. Lettuce, avocado, pepper, broccoli, and/or mangoes. (Serving size: 1 wrap, 3 ounces chicken mixture)