Clean and wash the Brussels sprouts and cut the end of the stem crosswise. Cook in boiling salted water for 10-12 minutes. Then drain and allow to drain.
Finely dice the bacon. Heat butter in a pot. Brown the bacon in it and take it out. Briefly sauté the flour in the frying fat. Add milk while stirring, bring to the boil and simmer for about 5 minutes. Season to taste with salt, pepper and nutmeg.
In the meantime, preheat the oven (electric cooker 200: °C/ circulating air: 175 °C/ gas: see manufacturer). Grate cheese. Mix the Brussels sprouts with the sauce and distribute in a large flat dish. Sprinkle with bacon and cheese. Bake in a hot oven for 5-10 minutes. Serve.
Goes well with: game goulash, shredded meat, guinea fowl breast or on salad