Combine the chicken thighs, chopped onion, enchilada sauce, herb seasoning, cumin, and salt into the crockpot. Set to on the highest temperature for 4 hours.
Shred the chicken using two forks.
(Optional) If wanting to make crispy, preheat the oven to 450F. Line a large baking pan with parchment paper.
Warm up the corn tortillas to either serve the chicken tinga as is with the shredded cheese, guacamole, and pickled onions. Or you can fill each corn tortilla with the chicken tinga and shredded cheese to place on the prepared baking pan, drizzle with olive oil, and bake for 8-10 minutes on each side.
Enjoy warm with Klarbrunn Pomelo Grapefruit for a complementary refreshment!