Grill the chicken breast with taco seasoning until fully cooked, then slice it.
In a large bowl, combine the chopped romaine lettuce, bell pepper, cherry tomatoes, black beans, cheddar cheese, corn, and tortilla strips.
Place the sliced chicken on top of the salad.
In a small bowl, whisk together mayonnaise, lime juice, olive oil, cumin, chilli powder, garlic powder, salt, and pepper until well combined.
Drizzle the dressing over the salad, or serve it on the side.