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Instructions:
- Cook the pasta in well-salted water until just al dente. Drain and set aside.
- In a saucepan over medium heat, melt the butter. Whisk in the flour and cook for about 1 minute to form a smooth roux.
- Slowly whisk in the warm milk and heavy cream, stirring constantly, until the sauce thickens and becomes silky.
- Reduce the heat to low and stir in the cheddar, Gruyère, and Parmesan until fully melted and smooth.
- Season the sauce with salt and pepper.
- Add the cooked pasta and gently fold until evenly coated.
- Remove from heat and stir in the truffle oil a little at a time, tasting as you go.
- Transfer to a serving dish or baking dish. If desired, sprinkle with breadcrumbs or extra Parmesan.
- For a golden finish, broil for 2 to 3 minutes, watching closely. Let rest for 5 minutes before serving.
Variations
- Add sautéed mushrooms for extra earthy depth.
- Substitute fontina for Gruyère for a creamier melt.
- Use black truffle butter instead of oil for deeper flavor.
- Add a pinch of nutmeg for subtle warmth.
Tips
- Warm the milk before adding to prevent lumps in the sauce.
- Use freshly grated cheese for the smoothest texture.
- Add truffle oil off the heat to preserve its aroma.
- A little truffle oil goes a long way—restraint is key for steakhouse-quality flavor.