Season chicken breasts on both sides with chili powder, cumin, and garlic powder.
Heat olive oil in a large skillet over medium-high heat.
Cook chicken for 5-6 minutes per side until the internal temperature reaches 165°F.
Remove chicken from heat and let rest for 5 minutes before slicing into thin strips.
In a small bowl, whisk together Greek yogurt, lime juice, chopped cilantro, and sea salt to create the dressing.
In a large mixing bowl, toss together the romaine lettuce, black beans, corn, and cherry tomatoes.
Divide the lettuce mixture into four serving bowls.
Top each bowl with sliced chicken and diced avocado.
Drizzle the yogurt dressing over each portion and serve immediately.