Add your black beans, mango, corn, bell pepper, red onion and cilantro to a large bowl. Then squeeze your lime juice over the top and toss until the salad is fully coated.Stir in your chili powder and season with salt and pepper to taste. (I'm pretty generous with the salt.)
Then cover and place your salad in the refrigerator to chill for at least one hour.
Right before serving, add your avocado and toss again. Serve immediately with extra lime juice, if desired.
