S'easy!!
Make Sauce with 50g Butter, 50g Flour & 375ml Milk.
Add 10mlish Dijon Mustard, 125g Cheese, S&P. I also add Cayenne.
Stir in 5 beaten Egg Yolks & fold in 5 Egg Whites beaten until stiff.
Pour into 1.2l Souffle dish, buttered & sprinkled with grated Parmesan.
Cook at 200Cish for 25-30 min.
For 4.