Heat the olive oil in a saucepan, add the onion and fry for 3-4 minutes, or until softened.
Place the quartered Brussels sprouts into a pan of boiling salted water and boil for 2-3 minutes, then drain well.
Add the sprouts to the pan with the onions. Add the garlic and fry for 1-2 minutes. Add the stock and cream and simmer for 3-4 minutes.
Stir in the cheese, season, to taste, with salt and freshly ground black pepper and pour into a serving bowl. Serve.
