01 - Thoroughly rinse 1 cup of quinoa under cold running water. In a medium saucepan, combine the rinsed quinoa and 2 cups of water. Bring the mixture to a boil, then reduce the heat to low. Cover the saucepan and simmer for 12–15 minutes, or until all the water has been absorbed and the quinoa is tender. Remove from heat, keeping it covered, and let stand for 5 minutes. Fluff the cooked quinoa with a fork and allow it to cool to room temperature.
02 - In a large mixing bowl, combine the cooled quinoa with 1 cup of halved cherry tomatoes, 1 medium diced cucumber, 1/4 cup of finely diced red onion, 1/4 cup of pitted and sliced Kalamata olives, 1/2 cup of crumbled feta cheese, 1/4 cup of chopped fresh parsley, and 2 tablespoons of chopped fresh mint (if using).
03 - In a small bowl, whisk together 3 tablespoons of extra-virgin olive oil, 2 tablespoons of freshly squeezed lemon juice, 1 teaspoon of dried oregano, 1/2 teaspoon of sea salt, and 1/4 teaspoon of freshly ground black pepper until well combined.
04 - Pour the prepared dressing over the assembled salad ingredients. Gently toss to ensure all components are evenly coated. Taste the salad and adjust the seasoning as needed. Serve chilled or at room temperature.