Dice the onions and sauté in the oil. Wash broccoli and cut into florets. Add the florets to the onions and sauté briefly. Top up with the vegetable stock, season and simmer gently for 15 minutes. Puree.
Sauce: melt the butter in a saucepan. Stir in flour and sweat. Gradually add the lukewarm milk and stir until smooth. Bring roux to the boil briefly and remove from the hob. Whip egg yolks with cream. Dice Gouda.
Put both in the roux. To taste.
Beat egg whites until stiff and fold in.
Fill into a pre-greased soufflé dish and bake immediately in a preheated oven at 200 ° C for 30-40 minutes.