Instructions
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Prep the Potatoes: Preheat your oven to 400°F (200°C). Toss the sliced potatoes with olive oil, salt, and pepper directly in your glass casserole dish until evenly coated. Spread them out so they lay somewhat flat.
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Make the Sauce: In a medium bowl or large measuring pitcher, whisk together the heavy cream, milk, minced garlic, sautéed onions, grated Parmesan, parsley, thyme, and nutmeg.
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The Pour-Over: Slowly pour the creamy mixture over the potatoes. Use a spoon to ensure the garlic and onion bits are distributed evenly and not just clumped in the center.
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Bake: Cover the dish tightly with aluminum foil. Bake for 30 minutes.
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The Golden Finish: Remove the foil and sprinkle the shredded Gruyère or Cheddar over the top. Return to the oven (uncovered) for another 20–25 minutes, or until the potatoes are tender and the top is bubbling and golden brown.
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Rest: Let the dish sit for 5–10 minutes before serving. This allows the sauce to thicken up so it coats the potatoes perfectly rather than pooling at the bottom.
Pro Tip
If you want an extra crunch, toss a handful of panko breadcrumbs with a little melted butter and sprinkle them on top during the last 10 minutes of baking.
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