Cook macaroni to just before al dente

Preheat oven to 350°F / 175°C

In a saucepan, melt butter over medium heat. Stir in enough flour to make a roux. Add milk to roux slowly , stirring constantly . Stir in cheese, and cook over low heat until cheese is melted and the sauce is a little thick. Put macaroni in large casserole dish, and pour sauce over macaroni. Stir well. Sprinkle with a little paprika.

Bake for 30 minutes.