Preheat your oven to 400°F and line a small baking sheet with parchment paper for easy cleanup.
Pat the chicken thighs dry with a paper towel and place them in a bowl, tossing with olive oil, chili powder, cumin, garlic powder, salt, and pepper until evenly coated.
Arrange the seasoned chicken on the prepared baking sheet and bake for 18-22 minutes, or until the internal temperature reaches 165°F and the edges are slightly charred.
While the chicken is baking, wash and chop the romaine lettuce and dice the red bell pepper.
In a large serving bowl, combine the romaine, rinsed black beans, and diced bell pepper to create the salad base.
Once the chicken is cooked, let it rest for 3 minutes before slicing it into thin strips.
Place the warm chicken strips over the salad and top with fresh avocado slices.
Drizzle the entire salad with lime juice and garnish with chopped fresh cilantro before serving.