In a large mixing bowl, combine the rinsed black beans, corn, diced red bell pepper, red onion, minced jalapeño, and chopped cilantro.
In a separate small whisking bowl, emulsify the olive oil, lime juice, ground cumin, chili powder, salt, and black pepper to create the dressing.
Pour the vinaigrette over the bean mixture and toss thoroughly until all components are evenly coated.
Cover and refrigerate for at least 30 minutes to allow the flavors to meld.
Gently fold in the cubed avocado immediately before serving to maintain texture and prevent oxidation.