Drain and Rinse Beans:
Drain and rinse the black beans, chickpeas, and kidney beans. Transfer them to a large mixing bowl.Add Corn to Bowl:
Add the corn to the bowl. If using frozen corn, thaw beforehand. If using canned corn, drain thoroughly. Fresh corn can be used directly.Dice Peppers and Onion:
Dice the red and yellow (or orange) bell peppers. Finely dice the red onion. For a milder taste, remove the jalapeño seeds before dicing. Place all chopped vegetables into the bowl.Chop Fresh Cilantro:
Chop the fresh cilantro and fold it into the bean and vegetable mixture.Whisk Dressing Ingredients:
In a separate small bowl, whisk together the olive oil, lime juice, cumin, chili powder, salt, and black pepper to create the dressing.Toss Salad and Chill:
Pour the dressing over the salad and toss until evenly coated. Cover and refrigerate for at least 30 minutes to allow flavors to blend. Stir again just before serving.