4 tbsp flour
3 cups milk
1 onion, chopped
2 cups grated cheese
1 rasher bacon, finely chopped
1 pinch cayenne
Melt butter and add bacon, onions & cayenne. Cook for 1 minute.
Remove from heat and mix in flour, then gradually add milk.
Return to heat and stir until thickens (be VERY careful not to let the mixture boil)
Add 3/4 of the cheese and stir until metled.
Add cooked maccaroni and pour into an oven-proof dish. Sprinkle with breadcrumbs and remaining cheese and bake until golden.