Cook the macaroni according to package instructions.
Drain and rinse with cold water. Set aside.
In a large bowl, combine the celery, onion, and red bell pepper. Add the cooked macaroni.
In a separate bowl, whisk together the yogurt, mayonnaise, mustard, vinegar, sugar, salt, and pepper. Pour the dressing over the macaroni mixture and stir to combine.
Chill the salad in the refrigerator for at least an hour before serving.
Interesting Facts
Macaroni Salad can be served as a side dish or main dish.
It is a great way to use up any leftover vegetables you may have.
Adding Greek yogurt to the dressing makes the salad healthier and adds a creamy texture.