Skillet Macaroni and Cheese from Martha Stewart

Who doesn't like a good homemade Mac and Cheese now and then? I know I do. I have so many recipes for it, including some original ones.
I like the idea of making this one in a skillet. I would probably use a Cast Iron Skillet to make it look rustic!
Here's my adapted recipe:

• 6 TBS Butter
• 1 C Fresh Breadcrumbs
• 1/4 C grated Parmesan Cheese
• 1 small yellow Onion, diced small
• 1/2 C all-purpose Flour
• 6 C  Whole Milk
• 3/4 pound Elbow Macaroni
• 3 C grated sharp White Cheddar Cheese
• 1 C grated Gruyere Cheese
• 1 tspDijon mustard
• Salt and pepper to taste

1. Heat broiler. In a large straight-sided, oven-safe skillet, melt butter. Remove 1 TBS butter and combine with Breadcrumbs and Parmesan Cheese.
2. 
   Add Onion to skillet and cook until softened. Whisk in Flour and cook, stirring, 1 minute. 
3. Gradually whisk in Milk and bring to a simmer.
4.  Add Macaroni and cook, stirring constantly and scraping bottom of pan, until tender, about 6 minutes. 
5. Remove from heat, stir in remaining Cheese and the Mustard.
6. Season  to taste with Salt and Pepper. 
7. Top with breadcrumb mixture and Broil until golden brown, 1 to 2 minutes.

Enjoy!

Peace in the Kitchen!