Clean the Brussels sprouts and cook them in salted water.
In the meantime, peel the onion and garlic.
Heat the oil in a pan and fry both ingredients in it until crispy. Then deglaze with the broth. Mix in the cream cheese and mustard and stir well. Finally, remove the Brussels sprouts from the heat, drain and add to the sauce. Thicken the sauce with starch depending on the desired consistency and season with salt, pepper and nutmeg.