1. Heat 1 tbsp. oil in large skillet over medium-high heat. Season chicken with Adobo. Cook chicken, flipping once, until golden brown on both sides and cooked through, 5- 7 minutes. Transfer chicken to plate; tent with foil to keep warm.
2. Heat remaining oil in skillet. Add onions and peppers. Cook, stirring, until tender, about 5 minutes. Stir in black beans and corn. Continue cooking until warmed through, about 2 minutes. Remove pan from heat. Stir in avocado, lemon juice and cilantro until combined.
3. Divide chicken among serving plates; top with black bean mixture. Serve warm.