From the movie [What’s Cooking?][wc]
* 8 oz package of macaroni
* 4 Tbsp butter, divided, plus more for casserole dish
* 1 c fresh bread crumbs
* 1 small onion, chopped
* 1 Tbsp flour
* 1 tsp salt
* 1/4 tsp dry mustard
* pepper to taste
* 1 1/2 c milk
* 3 c (~9 oz) shredded cheddar cheese
Pre-heat oven to 350°.
Cook macaroni according to package directions.
Melt half of the butter in a small saucepan.
Add the breadcrumbs and toss to coat.
Melt remaining butter in a medium saucepan over medium heat.
Add onion and cook until tender, about 5 minutes.
Stir in flour, salt, mustard, pepper, and Tabasco sauce until blended.
*Slowly* stir in milk, stirring constantly, until smooth.
**Remove from heat** and stir in cheese until melted.
Use some more butter to grease a casserole dish.
Place drained macaroni in casserole.
Pour cheese mixture over macaroni.
Sprinkle breadcrumb mixture over top.
Bake 20 minutes or until bubbling.
[wc]: http://www.imdb.com/title/tt0197096/ “IMDB entry for ‘What’s Cooking?'”