Step 1

Cook macaroni according to package directions using salted water. Drain and run cool water over the pasta until it is cooled.

Step 2

In another bowl stir together mayo, mustard, vinegar, pepper, sugar, salt, garlic, and onion powder. Add the onion, celery, and bell pepper. Mix well.

Step 3

In a large bowl, add the pasta and about half of the dressing and toss to coat. Cover and refrigerate the pasta and remaining dressing for at least 2 hours.

Step 4

When ready to serve, add remaining dressing and toss to coat. Add additional salt and pepper to taste.