Root Vegetable Gratin

Name: Root Vegetable Gratin
Ingredients: ["4 tablespoons unsalted butter, divided, plus more for baking dish", "1 1/2 cups coarse fresh breadcrumbs", "1 1/2 cups grated Parmesan, divided", "6 sprigs thyme plus 1 tablespoon leaves", "Kosher salt, freshly ground pepper", "3 cups heavy cream", "1 cup low-sodium chicken broth", "1 1/2 pounds celery root, peeled, sliced 1/16\" thick""

1 ingredients

1 steps

Ingredients

["4 tablespoons unsalted butter, divided, plus more for baking dish", "1 1/2 cups coarse fresh breadcrumbs", "1 1/2 cups grated Parmesan, divided", "6 sprigs thyme plus 1 tablespoon leaves", "Kosher salt, freshly ground pepper", "3 cups heavy cream", "1 cup low-sodium chicken broth", "1 1/2 pounds celery root, peeled, sliced 1/16\" thick""