Slice the chicken breast into thin, even strips to ensure quick and uniform cooking.
In a medium bowl, toss the chicken strips with the chili powder, cumin, sea salt, and black pepper until thoroughly coated.
Heat the olive oil in a large non-stick skillet over medium-high heat until shimmering.
Add the chicken to the skillet and sauté for 6 to 8 minutes, or until the edges are golden brown and the meat is cooked through.
While the chicken cooks, warm the corn tortillas in a separate dry skillet over medium heat for 30 seconds per side until pliable.
In a small bowl, lightly mash the avocado with a fork, leaving some chunks for a rustic texture.
Build the tacos by placing a handful of shredded cabbage on each tortilla, followed by a generous portion of the seasoned chicken.
Top each taco with the mashed avocado, a sprinkle of fresh cilantro, and a final drizzle of lime juice.