Mix together flour, mustard, salt and 4 dashes pepper. Saute onion and butter until softened. Add flour mixture, it will clump. Add milk one cup at a time until smooth - then add next cup.
In casserole layer 2/3 cheese mixture with macaroni. Pour 1/3 cheese into roux. Pour on top of macaroni and stir.
Top with 1 1/2 cup bread crumbs, 2 tbsp butter, 1/2 tsp sugar mixed together
Bake 350 for 20-30 minutes
Originally Submitted
10/26/2012
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