Preheat your oven to 375°F. Slice the corn tortilla into thin strips, place them on a baking sheet, and bake for 8-10 minutes until golden and crunchy.
In a small bowl, combine the chili powder, cumin, garlic powder, and sea salt. Rub the spice mixture evenly over the chicken breast.
Heat the olive oil in a skillet over medium-high heat. Add the chicken and cook for 6-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is nicely browned.
While the chicken cooks, prepare the zesty ranch by whisking together the Greek yogurt, lime juice, dried dill, and onion powder in a small ramekin.
Halve the cherry tomatoes, slice the radishes, and dice the avocado.
Remove the chicken from the skillet and let it rest for 3 minutes before slicing into thin strips.
Place the chopped romaine in a large bowl. Top with the tomatoes, radishes, avocado, and sliced chicken.
Drizzle the zesty ranch over the salad and finish with the crispy tortilla strips for a satisfying crunch.