Heat olive oil in a large skillet over medium-high heat. Add onion and peppers and season with salt and black pepper, to taste. Cook, stirring occasionally, until the veggies are soft and slightly caramelized, around 7-8 minutes.
Add chicken, ground cumin, smoked paprika, Mexican oregano, and chipotle powder and cook, stirring occasionally, until the chicken is lightly browned on all sides, around 3-4 minutes. Season with additional salt and black pepper, to taste.
Stir in black beans and frozen corn. Cook, stirring once or twice, until everything is warmed through, around 6-8 minutes. Taste and adjust seasonings, as desired.
Remove from heat and stir in half of the fresh cilantro and lime juice. If using, sprinkle cheese on top and cover with until cheese melts. Serve immediately topped with remaining cilantro, chopped avocado, and fresh lime wedges, if desired. Enjoy!