Make Chili-Lime Marinade:
In a small bowl, combine olive oil, lime juice, lime zest, chili powder, brown sugar, salt, cumin, smoked paprika, onion powder, garlic powder, chipotle chili powder (if using), and pepper; whisk until well blended. Apply the mixture to the chicken by brushing or dipping, then massage evenly to coat.Marinate Chicken:
If time allows, let the seasoned chicken rest at room temperature for 30 minutes, or refrigerate up to 8 hours and then bring to room temperature prior to cooking. Meanwhile, prepare the Avocado Salsa.Prepare Avocado Salsa Base:
For the Avocado Salsa: In a large bowl, mix cherry tomatoes, corn, red onion, red bell pepper, jalapeno (reserve seeds), cilantro, garlic, lime juice, cumin, salt, and pepper. Cover with plastic wrap and refrigerate for 30 minutes up to 24 hours.Add Avocado and Adjust:
Just before serving, gently incorporate the chopped avocados. Adjust seasoning with salt, pepper, or jalapeno seeds for extra heat as desired.