Donatella's Italian Mac & Cheese

Ingredients

• 1 pound Elbow Macaroni
• 3 large Egg Whites
• 1/2 cup Unsalted butter + some for greasing bowls
• 1/2 Onion Finely Chopped
• 1/3 cup All-Purpose Flour
• 3 1/2 cups Whole Milk
• 1 Bay Leaf
• 1 sprig Fresh Thyme
• 9 Whole Black Peppercorns
• 1 Kosher Salt
• 1/4 teaspoon Ground Nutmeg
• 1 carton (8 oz) Mascarpone Cheese
• 6 ounces Taleggio/Muenster cheese (rind removed) Diced
• 6 ounces Parmigiano-Reggiano Cheese Grated
• 6 ounces Pecorino Romano Coarsely Grated
• Truffle Oil and Fresh Thyme Optional
• 5 ounces Country-style White Bread About 3 thick slices.
• 2 cloves Garlic Minced
• 1/2 teaspoon Salt
• 1/4 teaspoon Freshly Ground Pepper
• 2 1/2 tablespoons Olive Oil