Mushroom and Leek Gratin | America's Test Kitchen

Name: Mushroom and Leek Gratin | America's Test Kitchen
Ingredients: 5 tablespoons unsalted butter , divided; 1⁄3 cup panko bread crumbs; 1½ teaspoons table salt , divided; 4-5 pounds leeks , white and light-green parts only, halved lengthwise, sliced 1 inch thick, and washed thoroughly (10 cups); 1 tablespoon water; 10 ounces cremini mushrooms , trimmed and quartered (halved if small); 10 ounces shiitake mushrooms , stemmed and sliced thin; ½ teaspoon pepper; 1 tablespoon all-purpose flour; 2 garlic cloves , minced; 2 teaspoons minced fresh thyme; 1 cup heavy cream; ¾ cup chicken broth; 4½ ounces Parmesan cheese , grated (2¼ cups)

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This creamy vegetable dish topped with crispy bread crumbs is worthy of a spot on the holiday table.

Keywords

Thanksgiving
Side Dishes
Holiday
Cheese
Vegetables
Easter
Casseroles
Make Ahead
Vegetarian

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Ingredients

5 tablespoons unsalted butter , divided
1⁄3 cup panko bread crumbs
1½ teaspoons table salt , divided
4-5 pounds leeks , white and light-green parts only, halved lengthwise, sliced 1 inch thick, and washed thoroughly (10 cups)
1 tablespoon water
10 ounces cremini mushrooms , trimmed and quartered (halved if small)
10 ounces shiitake mushrooms , stemmed and sliced thin
½ teaspoon pepper
1 tablespoon all-purpose flour
2 garlic cloves , minced
2 teaspoons minced fresh thyme
1 cup heavy cream
¾ cup chicken broth
4½ ounces Parmesan cheese , grated (2¼ cups)