Rinse quinoa well under cold water until the water runs clear to remove any bitterness.
In a medium saucepan, bring water to a boil. Add quinoa, reduce heat to low, cover, and simmer for about 15 minutes or until all the water is absorbed.
Remove from heat and let quinoa cool. Fluff with a fork and transfer to a large bowl.
Add cherry tomatoes, cucumber, feta, olives, parsley, and red onion to the bowl with the quinoa.
In a small jar, combine olive oil, lemon juice, dried oregano, salt, and black pepper. Shake well until combined.
Pour the dressing over the quinoa salad and toss gently to combine.
Chill the salad in the refrigerator for 30 minutes before serving for best flavor.
Notes
Feel free to customize this salad by adding grilled chicken or shrimp for a heartier meal.