Wash and peel the butternut squash.Cut it in half lengthwise and remove the seeds with a spoon.Slice the flesh into thin strips and arrange them vertically in a large gratin dish.
1 butternut squash
Preheat your oven to 170°C.
In a saucepan, melt the butter with the nutmeg and crushed (and peeled) garlic.Add the flour and stir.Gradually pour in the milk, stirring constantly until you have a smooth sauce.
Remove from heat, add the cream and half the cheese. Season with salt and pepper, then mix.
10 cl fresh cream, 100 g grated cheese, Salt and pepper
Pour the sauce over the butternut squash in the gratin dish and sprinkle with the remaining cheese.Bake for 30 to 40 minutes.Check for doneness by inserting a knife; the squash should be very tender. If it is still too firm, continue baking for another 10 minutes.