Dice the chicken breast into small, bite-sized pieces and place them in a bowl.
Toss the chicken with chipotle powder, garlic powder, sea salt, and black pepper until evenly coated.
Heat the olive oil in a cast-iron skillet over medium-high heat until it begins to shimmer.
Add the seasoned chicken to the skillet and sauté for 6-8 minutes, stirring occasionally, until the edges are charred and the meat is cooked through.
While the chicken is cooking, whisk together the shredded cabbage, lime juice, and cilantro in a small bowl to create a quick slaw.
Warm the corn tortillas directly over a low gas flame for 15 seconds per side or in a dry pan until they are pliable and slightly toasted.
Divide the charred chicken among the three tortillas, topping each with the cabbage slaw, diced red onion, and fresh avocado slices.