Potatoes are such a versatile vegetable and this is the kind of dish that will be devoured the minute you put it on the table. It’s hard to say no to a second helping of my potato and bacon au gratin.
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Preheat the oven to 350°F.
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Sauté the bacon in a heavy large sauté pan over medium heat until just golden brown, about 7 minutes.
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Using a slotted spoon, transfer the bacon to a bowl, leaving the bacon drippings in the pan.
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Add the onions to the same pan and sauté until they are translucent, about 4 minutes.
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Add the garlic and sauté until the onions are pale golden, stirring often, about 2 minutes.
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Add the cream, milk, and thyme.
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Bring the mixture to a simmer. Set aside.
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Meanwhile, using a mandoline slicer or a very sharp knife, cut the potatoes crosswise into 1/8-inch-thick slices.
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Toss the potato slices in a large mixing bowl with the warm cream mixture to coat.
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Add the salt and black pepper and toss again.
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Neatly arrange one-fourth of the potato mixture in a 13x9x2-inch baking dish or other 2-quart baking dish. Sprinkle 1/2 cup of the cheese over.
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Repeat layering the remaining potato mixture and cheese 3 more times.
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Cover with foil and bake for 40 minutes.
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Remove the foil and bake until the potatoes are tender and golden brown on top, about 20 minutes.
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You should be able to gently poke a fork through the potatoes when finished.
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Let stand for 10 minutes to cool slightly, then serve.