Cook quinoa according to the package instructions.
Rinse and drain black beans; quarter cherry tomatoes, dice bell pepper and green onions, and chop fresh cilantro. Add all to a large mixing bowl, along with the corn.
Combine all five dressing ingredients in a small bowl and whisk together until thoroughly mixed; add to the veggie mixture, along with the cooked quinoa. Toss to combine.
Serve immediately or cover and chill until ready to eat.