Potato Gratin with Thyme

I love this gratin for its simplicity; just five ingredients. It's all you need, and it's a perfect companion to lamb, beef, or other roasted meats.
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  • Level: Intermediate
  • Total: 50 min
  • Prep: 5 min
  • Cook: 45 min
  • Yield: 2 servings
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Ingredients

1 pound Yukon gold or red potatoes

1 1/2 cups grated Gruyere

1 large egg

1 cup whole milk

2 tablespoons freshly chopped thyme leaves

Directions

  1. Preheat oven to 400 degrees F. Butter a 1 1/2-quart shallow baking dish.
  2. Bring a large saucepan of salted water to a boil. Peel potatoes and cut into 1/8-inch slices - a food processor is good for this. Add potatoes to boiling water and cook 4 minutes. Drain potatoes thoroughly in a colander.
  3. Arrange 1/3 of the potatoes in baking dish, top with 1/3 of the cheese, 1/3 of the thyme leaves, and sprinkle with salt and freshly ground pepper. Repeat twice more, ending with a layer of cheese and thyme.
  4. Heat milk just to boiling. In a small bowl whisk egg and add hot milk, stirring. Pour evenly over potatoes. Bake 30 minutes, or until top is golden and potatoes are tender.