smittenkitchen.com

potato and leek gratin

Name: potato and leek gratin
Ingredients: 2 tablespoons unsalted butter, plus more for pan; 12 1/2 pounds yukon gold potatoes, unpeeled, scrubbed, thinly sliced; 11 thick or 2 slimmer leeks, halved, washed, cut into 1-inch segments; 12 cups heavy cream; 1 Kosher salt and freshly ground black pepper; 12 garlic cloves, minced; 1 Leaves from 3 sprigs fresh thyme; 11/2 cup plain breadcrumbs (panko or homemade are great here); 13/4 cup coarsely grated gruyère, comte, or baby swiss cheese