Step 1

In a large pot of salted boiling water, cook the macaroni until al dente, about 8-9 minutes. Drain and rinse with cold water. Drain well.

Step 2

To a large bowl, add the garlic powder, celery salt, mayonnaise, and macaroni, and toss to coat. Stir in cayenne, if using.

Step 3

Stir in green pepper, celery, onion, and parsley, and season to taste with salt and pepper.