Season the chicken breast with chili powder, cumin, sea salt, and black pepper.
Heat olive oil in a skillet over medium-high heat and sear the chicken until golden and cooked through, about 6 minutes per side.
In the same pan, lightly char the sweet corn for 2-3 minutes until slightly toasted.
In a small bowl, whisk together the Greek yogurt, lime juice, and chopped cilantro to create a creamy dressing.
Slice the cooked chicken into strips or bite-sized pieces.
In a large bowl, combine the mixed greens, charred corn, black beans, halved cherry tomatoes, and diced red onion.
Top the salad with the sliced chicken and fresh avocado slices.
Drizzle the lime-yogurt dressing over the salad and toss gently to combine.