potatoes au gratin

How To Make potatoes au gratin

• 1

  Adjust oven rack to upper middle position & preheat oven to 400 degrees F. Grease a 13" x 9" baking dish. In a large bowl, combine pecorino, cheddar, 1/4 C oil, panko & 1/2 tsp pepper; mix well & set aside.
• 2

  Heat 1/4 C oil in skillet over medium heat until shimmering. Add onions, 1/2 tsp salt & 1/4 tsp pepper & cook, stirring frequently, until browned, 15 minutes. Add garlic & 1/4 tsp thyme & cook until fragrant, 30 seconds. Add 1/2 can broth & cook until nearly evaporatd, scraping up any bits, 3 minutes. Remove from heat; set aside.
• 3

  Toss potatoes, remaining oil, 1 tsp salt, 1/2 tsp pepper & remaining thyme together in a bowl. Arrange half of potatoes in prepared dish, spread onion mixture in even layer over potatoes & distribute remaining potatoes over onions. Pour remaining broth over potatoes. Cover dish tightly with aluminum foil & bake for 1 hour.
• 4

  Remove foil, top au gratin with reserved cheese mixture & continue to bake until top is golden brown & potatoes are completely tender, 15 - 20 minutes. Let cool for 15 minutes. Serve.
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