Cook the pasta according to package instructions until al dente. Drain and rinse under cold water.
In a large mixing bowl, combine the cooked pasta, cherry tomatoes, cucumber, red onion, and bell peppers.
In a separate bowl, whisk together the mayonnaise, Greek yogurt, and Dijon mustard.
Season the dressing with salt and pepper to taste.
Pour the dressing over the pasta and vegetables, tossing to combine thoroughly.
Cover the salad and refrigerate for at least 30 minutes to let the flavors meld.
Before serving, give the salad a gentle toss and garnish with fresh herbs.
Serve chilled as a side dish or light meal.