Prep your ingredients: Start by chopping your mango, tomato, and bell pepper into small, even pieces. Mince the red onion and chop the cilantro.
Combine the salad: In a large mixing bowl, add the chopped mango, tomato, bell pepper, thawed corn, rinsed black beans, cilantro, and red onion.
Make the dressing: In a small bowl or jar, whisk together the olive oil, fresh lime juice, ground cumin, salt, and red pepper flakes until well combined.
Toss and serve: Pour the dressing over the salad ingredients. Gently toss everything together until the salad is fully coated. Serve immediately or chill first.