Spray a 6-quart Crock-Pot with cooking spray. Pour chicken broth in the Crock-Pot. Trim off fatty parts of chicken thighs. Some fat is fine; most will render off; I just slice off the big pieces on the sides. Combine the brown sugar, chili powder, paprika, cumin, garlic powder, salt, and pepper in a small bowl. Stir, then rub evenly over the chicken.
Place the seasoned chicken in the Crock-Pot in an even layer. No need to stir. Cover and cook on low for 4–6 hours.
Once the meat is completely cooked, remove the chicken from the Crock-Pot and place in a large bowl. Shred with two forks.
When the chicken is almost finished cooking, prepare the sauce. Combine all the ingredients in a blender or food processor. Blend until completely smooth. Taste and adjust ingredients to preference. Toss about half the sauce with the shredded chicken to warm it through. Add sauce gradually just until the chicken is nicely coated.
Spray both sides of the tortillas with cooking spray and char the tortillas directly over the gas flames for a few seconds. Use tongs to flip until tortillas are lightly charred and soft. Immediately fold the tortilla in half, so it will fold into a taco later, and set aside.
Top charred tortillas with saucy chipotle chicken. Add your favorite toppings; I like drained, rinsed, and warmed black beans, thinly sliced ripe avocado, pickled red onions, a sprinkle of cotija cheese, fresh cilantro, and a few squeezes of fresh lime. If desired, add additional chipotle sauce to tacos or dip the tacos in the sauce. Any leftover sauce will stay good for 5–7 days in an airtight container in the fridge and can be tossed with cooked chicken or pork. Enjoy while hot!
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Notes
Note 1: If you'd like to add quick pickled red onions to top these tacos with, follow the recipe below:
1 large red onion, thinly sliced
1/4 cup red wine vinegar
1 teaspoon salt
1 tablespoon granulated sugar
In a medium bowl, combine the red onion, red wine vinegar, salt, and sugar. Toss to coat. Leave at room temperature and toss every 5 minutes or so while preparing the rest of the meal.Storage: Store chicken in an airtight container in the fridge for up to 4 days (or freeze for 3 months). Sauce lasts a week in the fridge. Store toppings separately in the fridge.