Rinse the quinoa under cold water to remove any bitterness. Drain well.

In a medium saucepan, bring 2 cups of water to a boil. Add the quinoa, reduce heat to low, cover, and simmer for 15 minutes or until the water is absorbed. Remove from heat and let it sit covered for 5 minutes. Fluff with a fork.

While the quinoa is cooking, prepare the vegetables. Dice the red bell pepper, avocado, and finely chop the red onion and cilantro.

In a large bowl, combine the cooked quinoa, black beans, red bell pepper, avocado, red onion, and cilantro.

In a small bowl, whisk together the olive oil, lime juice, cumin, salt, and pepper to make the dressing.

Pour the dressing over the quinoa mixture and toss gently to combine. Adjust seasoning if needed.

Serve immediately or refrigerate for at least 30 minutes to let the flavors meld together.