Cook the quinoa according to package directions OR in a small pot, bring the quinoa and 2 cups of water to a boil and then cover, reduce to low heat and let simmer for ~15 minutes until quinoa is cooked.
Let the cooked quinoa cool for 15-20 minutes. In the meantime, prep the vegetables.
To a large bowl, add quinoa, black beans, cucumber, yellow pepper, onion and feta cheese. Stir.
Mix the dressing ingredients in a glass measuring cup or bowl. Pour the dressing over the salad and stir well. Add extra salt and pepper if needed.
Store in an airtight container for up to 5 days in the fridge. Enjoy!