Great Grammy's Macaroni Cheese

This has been requested frequently enough that i will finally submit it. this is known as great grammy's mac & cheese thanks to my children. it's my grandmother's recipe. i spent a day watching very carefully & making notes. ;) i don't always bake it. sometimes i just pour the cheese sauce over the macaroni & start eating! the dish i bake this in is a corningware cornflower 3 quart dish - it is square with high sides vs. Rectangular like a smaller 9x13x2.

Steps

Preheat oven to 350f grease casserole dish.

Cook macaroni in boiling , well salted water until al dente.

Drain.

Melt butter in top of double boiler.

Add salt , ground mustard & flour , whick until smooth.

Whisk in milk until smooth.

Heat until thickened.

I will take the top of the double boiler & put it on direct heat but keep it low & do not stop stirring or it will burn & be ruined !.

Add cheese & whisk until melted.

Put 1 / 2 cooked macaroni in casserole.

Pour about 1 / 3 cheese sauce over macaroni.

Stir well.

Lay slices of american cheese over this.

Add rest of macaroni & sauce.

Stir carefully.

Sprinkle top with parmesan cheese to cover & some pepper to taste.

Bake 1 hour until top is browned & bubbly.

Ingredients

elbow macaroni, butter, all-purpose flour, ground mustard, salt, whole milk, cheddar cheese, american cheese, parmesan cheese, ground black pepper