The best part of a gratin is the crispy crust, and, here in this shallow sheet-pan version, there's more of it. Flaky panko bread crumbs — with a sprinkling of mozzarella and Gruyère — form a crisp, almost chiplike topping that tastes not unlike the edges of garlicky, cheesy Texas toast. In fact, the topping comes off in large, snackable pieces. As this bakes (for just 10 minutes!), the spice blend perfumes the kitchen, thanks to herbes de Provence. The shiitakes add earthy heft and incredible umami, but for a more delicately flavored gratin, you can leave them out. Serve this with a big green salad or eat it straight out of the pan.
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Author
Eric Kim | 2021-09-22
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