In a small bowl mix together the chili powder, salt, garlic powder, oregano, cumin and olive oil.
Slather the rub all over the chicken breasts. Let it sit on there for about 30 minutes in the fridge.
Grill the chicken for about 5 minutes per side, depending on the thickness of the chicken. When the juices run clear, the chicken should be cooked through. Allow to rest a few minutes before slicing
Make the dressing in a little bowl or mason jar. Mix up the lime juice, olive oil, cilantro, garlic, salt and pepper.
To assemble the salad, start with the romaine and top with some tomato, avocado, red onion and black beans.
Top the salad with the sliced grilled chicken and finish it off with that refreshing lime dressing.