Dice the chicken breast into small, bite-sized pieces.
In a small bowl, combine the chili powder, cumin, garlic powder, sea salt, and black pepper.
Toss the chicken pieces with the spice blend until they are evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the seasoned chicken to the skillet and sauté for 6-8 minutes, stirring occasionally, until the chicken is golden brown and cooked through.
While the chicken is cooking, prepare the crema by mashing the avocado in a small bowl and whisking in the Greek yogurt and lime juice until the mixture is smooth and creamy.
Warm the corn tortillas in a separate dry pan or directly over a low gas flame for about 30 seconds per side until pliable.
Assemble the tacos by dividing the cooked chicken evenly between the two tortillas.
Top each taco with the shredded cabbage, a generous dollop of the avocado crema, and fresh cilantro.