Cook the gluten-free pasta according to the package instructions. Drain and rinse with cold water.
In a large mixing bowl, combine the cherry tomatoes, cucumber, red bell pepper, yellow bell pepper, red onion, black olives, feta cheese (if using), and fresh parsley.
In a small bowl, whisk together the olive oil, red wine vinegar, dried oregano, salt, and pepper.
Pour the dressing over the salad and toss to combine. Serve immediately or refrigerate for later.