30g plain flour
1 tsp mustard
85g grated strong cheddar cheese
MethodPreheat the oven on to 200C/400F/Gas 6.
Melt the butter, stir in the flour and cook for 1 minute.
Gradually stir in the milk. Cook for 1 minute until you have a thick sauce.
Stir in the mustard and grated cheese.
Separate the eggs. Beat the yolks into the sauce.
Whisk the egg whites until you have soft peaks. Fold into the sauce.
Pour into an oven-proof dish and cook for 20-25 minutes.