Start by washing and dicing all the fresh ingredients. Tomatoes, bell peppers, onions, and jalapeños should be small so every bite has a balanced flavor. Avocado should be scooped gently to maintain its creaminess.
Rinse the black beans and black-eyed peas thoroughly and add them to a large bowl along with thawed corn. These ingredients add heartiness and texture to the dish.
In a small bowl, whisk together olive oil, lime juice, red wine vinegar, sugar, salt, black pepper, and garlic powder. Taste and adjust seasoning as needed—it should be bright and zesty.
Pour the dressing over the vegetables and beans, and gently toss until evenly coated. Refrigerate for at least 30 minutes to let the flavors meld.