In a large bowl, combine the shredded chicken, black beans, corn, cherry tomatoes, avocado, red onion, and cilantro.
In a separate small bowl, whisk together the lime juice, olive oil, chili powder, cumin, salt, and pepper until well blended.
Pour the dressing over the salad mixture and toss gently to combine.
Add the chopped romaine lettuce and toss again until everything is evenly coated.
Serve immediately, garnished with tortilla strips if desired, or refrigerate for 30 minutes to allow flavors to meld.