Dice the chicken breast into small, bite-sized pieces and place them in a medium mixing bowl.
Sprinkle the chili powder, cumin, garlic powder, sea salt, and black pepper over the chicken and toss until every piece is evenly coated.
Heat the extra virgin olive oil in a large non-stick skillet over medium-high heat.
Add the seasoned chicken to the skillet and sauté for 6 to 8 minutes, stirring occasionally, until the chicken is cooked through and has a golden-brown crust.
While the chicken is cooking, prepare the salsa by mashing the avocado in a small bowl and stirring in the finely diced red onion, chopped cilantro, and a squeeze of lime juice.
Warm the corn tortillas in a separate dry skillet or directly over a low gas flame for about 30 seconds per side until soft and pliable.
Assemble the tacos by dividing the sautéed chicken between the two tortillas and topping each with a generous spoonful of the fresh avocado salsa and an extra squeeze of lime.