Prepare the Dressing: In a small container with a secure lid, combine the olive oil, fresh lime juice, minced garlic, salt, and cayenne pepper. Seal the container and shake vigorously until the dressing is well blended and emulsified, allowing the flavors to meld.
Combine the Salad Base: In a large mixing bowl, add the rinsed black beans and thawed corn kernels. Gently fold in the diced avocado, chopped red bell pepper, tomatoes, sliced green onions, and fresh cilantro until evenly distributed.
Dress and Toss the Salad: Give the dressing another quick shake, then pour it evenly over the salad mixture. Using a large spoon or salad tongs, gently toss all the ingredients together, making sure the dressing coats everything thoroughly without mashing the avocado.
Serve and Enjoy: Transfer the salad to a serving dish or individual bowls. This vibrant, fresh salad can be enjoyed immediately or chilled for 30 minutes to allow the flavors to deepen before serving.
