The Best Baked Mac and Cheese | Dinners | Umami

Ingredients

• Kosher salt and freshly ground black pepper
• 1 pound elbow macaroni
• Half a loaf day-old French bread
• 1 stick (8 tablespoons) unsalted butter
• 1/4 cup all-purpose flour
• 2 teaspoons mustard powder
• 1/4 teaspoon cayenne
• 3 cups milk
• 8 ounces fontina cheese, grated (about 2 cups)
• 8 ounces Gruyere, grated (about 2 cups)
• 1 pound sharp yellow Cheddar, grated (about 4 cups)