Place the chicken breasts in the crockpot, pour in the broth, and sprinkle the cumin, paprika, and garlic powder over the top. Add the sliced onions around the chicken. Cover and set the crockpot to low.
Let the chicken cook gently for about 4 hours until it is tender and easily pulls apart with a fork, filling the kitchen with a savory aroma.
Once cooked, remove the chicken breasts from the crockpot and place them on a cutting board. Use two forks to shred the meat into bite-sized pieces, watching the juices and bits of onion fall away.
Stir in the lime juice to brighten the flavors and distribute evenly through the shredded chicken.
Warm the tortillas in a skillet or microwave until soft and pliable, ready for wrapping.
Spoon the flavorful shredded chicken onto each tortilla, then top with shredded lettuce, cheese, or hot sauce if desired.
Wrap up the tortillas tightly, and serve immediately for a juicy, tender bite with crispy or soft textures depending on your tortilla choice.