Brussels Sprout Gratin | America's Test Kitchen

Ingredients

• 2 1/2 pounds Brussels sprouts , trimmed and halved through stem
• 1 tablespoon vegetable oil
• Salt and pepper
• 3 tablespoons unsalted butter
• 1/4 cup panko bread crumbs
• 1 shallot , minced
• 1 garlic clove , minced
• 1 tablespoon all-purpose flour
• 1 1/4 cups heavy cream
• 3/4 cup chicken broth
• 2 ounces Gruyère cheese , shredded (1/2 cup)
• 1 ounce Parmesan cheese , grated (1/2 cup)
• Pinch ground nutmeg
• Pinch cayenne pepper