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Cook the Pasta: Boil your pasta just shy of al dente—this helps it stay firm when baked later. Drain and set aside.
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Make the Sauce: Start with a roux by melting butter and whisking in flour. Slowly add warm milk, stirring continuously until it thickens. Stir in your cheeses, saving a bit for topping.
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Add the Magic: Stir in a drizzle of truffle oil—start with a teaspoon and adjust to taste. Too much can overpower the dish, so go slow!
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Combine and Assemble: Mix the cooked pasta into the cheese sauce. Pour everything into a buttered baking dish.
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Crisp It Up: Top with breadcrumbs mixed with a touch of melted butter and Parmesan. Bake at 375°F (190°C) for 20–25 minutes, or until the top is golden and bubbly.