Rub the chicken breast with chili powder, ground cumin, sea salt, and black pepper until evenly coated.
Heat olive oil in a medium skillet over medium-high heat and sear the chicken for 6-7 minutes per side until cooked through.
Remove chicken to rest on a cutting board, then add corn kernels to the same hot skillet and cook for 2-3 minutes until slightly charred.
Chop the romaine lettuce into bite-sized pieces and place in a large salad bowl.
Slice the cooked chicken into thin strips and halve the cherry tomatoes.
Top the lettuce with the sliced chicken, charred corn, black beans, tomatoes, diced red onion, and avocado slices.
Squeeze fresh lime juice over the entire salad and garnish with chopped cilantro before serving.