Cook macaroni in salted water according to package directions; drain and transfer to a large bowl.
Meanwhile, in a medium bowl, whisk together mayonnaise, vinegar, mustard and garlic powder; stir mixture into cooked macaroni. Fold in celery, onion and parsley; season to taste with salt and pepper. Serve warm or chilled. Yields about 2/3 cup per serving.
Swap regular pasta for the whole wheat pasta, if desired (could affect PointsPlus values).
PointsPlus Value: 4