Cook the pasta according to package instructions until al dente. Drain it well, then set it aside to cool.

In a large mixing bowl, combine the cooled pasta with cherry tomatoes, diced cucumber, red onion, bell peppers, and chopped parsley.

In a small bowl, whisk together the olive oil, lemon juice, Dijon mustard, salt, and pepper.

Pour the dressing over the pasta mixture and give it a good toss to ensure everything is well-coated.

Chill the salad in the refrigerator for at least 30 minutes before serving to let those flavors meld together beautifully.