Simple Macaroni and Cheese    

From Smitten Kitchen

2 T butter (one to butter the dish, one for topping)

1 c sour cream

2 c milk

1 t mustard

Pinch cayenne

1/2 t salt

1/4 t pepper

1 lb grated sharp cheddar cheese (hold back about 1/2 c of grated cheese for topping)

1/2 lb uncooked elbow macaroni

Preheat the oven to 375.  Generously butter a 10" or so casserole dish with 1 T of butter.  Mix the sour cream and spices, add milk, then the cheese and macaroni.  Mix well.  Dump into the casserole dish, cover, and bake for 30 minutes.  Remove cover, stir, sprinkle with remaining cheese, dot with remaining butter, bake for another 30 minutes uncovered.  Remove from oven and let sit 15 minutes.