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.
Season the chicken breast evenly with half of the sea salt, black pepper, cumin, and chili powder.
Heat a grill pan or skillet over medium-high heat. Cook the chicken for 6-7 minutes per side, or until the internal temperature reaches 165°F. Let the chicken rest for 5 minutes before slicing into strips.
In a small bowl, whisk together the extra virgin olive oil, lime juice, and the remaining salt, pepper, cumin, and chili powder to create the dressing.
Roughly chop the romaine lettuce, halve the cherry tomatoes, and thinly slice the red onion.
In a large serving bowl, toss the romaine, tomatoes, and onion with the prepared lime-cumin dressing.
Top the salad with the sliced grilled chicken, diced avocado, and the toasted tortilla strips.