Cook the pasta according to the package directions until al dente. Drain and rinse under cold water until completely cool.
Add the pasta, cherry tomatoes, cucumber, bell pepper, red onion, feta cheese, and parsley to a large mixing bowl.
In a small bowl or mason jar, whisk together the lemon juice, red wine vinegar, olive oil, Dijon mustard, oregano, garlic powder, salt, and pepper until well combined.
Pour the dressing over the pasta salad and gently toss until everything is evenly coated.
Refrigerate for at least 30 minutes before serving to allow the flavors to blend together.
Toss once more before serving and garnish with additional feta if desired.