Cook macaroni according to package directions, omitting salt and fat. Drain and set aside. Meanwhile, melt butter in a saucepan over medium heat. Add flour, and whisk 1 minute. Gradually whisk in milk. Bring to a low boil; cook 1 minute. Whisk in worcestershire, dry mustard, onion powder, celery salt, pepper and cheese powder. Remove from heat. Add cheeses; stir until melted. Combine cheese sauce and macaroni in a bowl; stir well. Serve immediately. Yield: 6 servings (serving size: 3/4 cup). MJF Notes: Original recipe called for 1-3/4 cups uncooked elbows. This was too little so I upped to 2 cups. Original called for minced sauteed onions. I replaced with onion powder. This was darn good when I ate immediately. Will freeze and see how it holds up. After freezing then microwaving, it was a little dry. The above now uses 2-1/2 cups milk instead of 2. Try next.