Preheat oven to 400F (200C). Grease a 9X13 inch (22X33cm) rectangle pan or 11-inch (28cm) round pan with butter or oil.
Peel the potatoes, then, using a mandolin or a sharp knife thinly slice the potatoes.
Spread about 1/3 of the potato slices into the bottom of the prepared baking dish. Top with about 1/2 of the onion slices. Sprinkle 3 tablespoons flour over the potato and onion. Dot with butter cubes (1-2 tablespoons). Season the entire layer with salt and pepper. Repeat layering twice more. Spread 1-2 tablespoons of butter over the top layer. Set aside.
In a sauce pan, heat milk, heavy cream, garlic cloves, rosemary, thyme, salt, pepper and nutmeg. Heat over low heat, stirring occasionally, for 6-7 minutes. Remove garlic, rosemary and thyme.
Pour milk mixture over the potatoes.
Cover with aluminum foil and bake for 50-60 minutes, after 50 minutes remove the foil and bake for 30-40 minutes, until golden and the potatoes are tender.
Video
Notes
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