Steps
1. In a mixing bowl, combine the diced cucumber, cooked quinoa, red bell pepper, and chopped parsley.
2. In a small bowl, whisk together the olive oil, lemon juice, salt, and pepper to create the vinaigrette.
3. Pour the vinaigrette over the salad and toss gently to combine.
4. If desired, sprinkle feta cheese on top before serving.
5. Serve chilled or at room temperature.