Slice the chicken breast into thin, even strips for quick cooking.
In a small bowl, whisk together the chili powder, cumin, garlic powder, sea salt, and black pepper.
Toss the chicken strips in the spice blend until every piece is thoroughly and evenly coated.
In a medium bowl, combine the shredded cabbage, lime juice, apple cider vinegar, and chopped cilantro to create the zesty slaw.
Heat the olive oil in a non-stick skillet over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-7 minutes, turning occasionally, until golden brown and cooked through.
Warm the corn tortillas in a dry pan or over an open flame for 30 seconds per side until pliable.
Assemble the tacos by dividing the chicken between the tortillas, then topping with the crunchy slaw, sliced avocado, and a dollop of Greek yogurt.