Cook the Quinoa: Rinse the quinoa under cold water. In a medium saucepan, bring 2 cups of water to a boil. Add the quinoa, reduce the heat to low, cover, and simmer for 15 minutes or until the water is absorbed. Remove from heat and let it sit for 5 minutes. Fluff with a fork and let it cool.
Prepare the Vegetables: In a large bowl, combine the cherry tomatoes, cucumber, red onion, Kalamata olives, feta cheese, and parsley.
Make the Dressing: In a small bowl, whisk together the olive oil, lemon juice, dried oregano, salt, and pepper.
Combine and Serve: Add the cooked quinoa to the vegetable mixture. Pour the dressing over the salad and toss to combine. Serve chilled or at room temperature