Slice the chicken breast into thin bite-sized strips.
In a small bowl, combine the chili powder, cumin, garlic powder, sea salt, and black pepper.
Toss the chicken strips in the spice blend until evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and cook for 5-7 minutes, stirring occasionally, until golden brown and cooked through.
While the chicken cooks, toss the shredded cabbage with half of the lime juice in a separate bowl.
Warm the corn tortillas in a dry pan or over an open flame for 30 seconds per side.
Divide the cooked chicken between the two tortillas.
Top with the lime-dressed cabbage slaw, sliced avocado, and fresh cilantro.
Drizzle the remaining lime juice over the tacos and serve immediately.