Combine black beans, bell peppers, jalapeños, onion, and radishes in a large bowl.
Dress with olive oil, the juice of one lime, 1 teaspoon kosher salt, and chili powder or tajín to taste.
Add cilantro and avocado and mix gently.
Taste the mixture; adjust with more lime and salt as desired.
Eat right away, scooping it up with tortilla chips. Leftovers keep a few days in the fridge.
