Pat the chicken breast dry and cut 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 evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and sauté for 6 to 8 minutes until golden brown and cooked through.
While the chicken cooks, mash the avocado in a bowl with the lime juice, minced red onion, and chopped cilantro.
Warm the corn tortillas in a dry pan or over an open flame until soft and slightly charred.
Thinly slice the radishes for a crunchy garnish.
Divide the chicken among the three tortillas and top each with a dollop of avocado salsa and radish slices.