Cook the fusilli pasta according to the package directions until al dente. Drain and rinse with cold water to cool it down.
In a large bowl, combine the cherry tomatoes, cucumber, red and yellow bell peppers, red onion, kalamata olives, and feta cheese.
Add the cooled pasta to the bowl and toss everything together.
In a small bowl, whisk together the olive oil, red wine vinegar, Dijon mustard, garlic, dried oregano, salt, and pepper until well combined.
Pour the dressing over the pasta salad and toss everything together until all the ingredients are evenly coated.
Add the chopped parsley to the bowl and toss again.
Cover the bowl with plastic wrap and chill the salad in the refrigerator for at least 30 minutes before serving.