Season chicken breasts and grill or pan-sear over medium-high heat for 6 minutes per side or until internal temperature reaches 165°F (74°C).
Let the chicken rest for 5 minutes, then dice into 1/2-inch cubes.
In a small bowl, whisk together Greek yogurt, BBQ sauce, and ranch seasoning until smooth to create the high-protein dressing.
In a large mixing bowl, combine chopped romaine, black beans, corn, cherry tomatoes, and red onion.
Add the diced chicken and cilantro to the bowl.
Pour the dressing over the salad and toss thoroughly to ensure even distribution.
Top with shredded Monterey Jack cheese and serve immediately.