Place the chicken in slow cooker and sprinkle with chili powder, cumin, chipotle powder, salt and pepper. Add garlic and salsa and rub around to combine. Cover; cook on high for 4 hours or low for 6-8 hours.
Either shred the chicken with 2 forks right in the slow cooker or transfer to a plate to shred. Moisten chicken with cooking juices and serve with desired tortillas/taco shells and toppings. You could even serve the chicken over rice with salsa and diced avocados.
Notes
Leftovers are great in a quesadilla!
Oven method: preheat oven to 350 degrees. In step 1, place all ingredients (except accompaniments) in a 5-quart Dutch oven or ovenproof pot with a tight-fitting lid. Add 2 cups water or chicken stock. Cover and bake until chicken is fork-tender, about 2 hours. Proceed with step 2.
Recipe by Pamela Salzman at https://pamelasalzman.com/slow-cooker-chicken-tacos-recipe/