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Cut the potatoes into 2-inch cubes. Add them to a large pot, cover them with cold water, and add salt. Bring them to a boil, cook for 10 minutes, drain and cool for 20 minutes. The potatoes will now be only partly cooked and should be completely dry before you roast them.
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Preheat the oven to 400 degrees F.
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Toss the potatoes with the oil and salt and pepper, to taste, and spread them in one layer on a baking sheet. Roast until crispy and cooked through, about 45 minutes.
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While the potatoes are roasting, make the herb butter: Mix the softened butter with the parsley, sage, rosemary, and thyme and season it with salt and pepper, to taste.