01 -
Bring a large pot of salted water to a boil over high heat. Add pasta and cook according to package instructions until al dente. Drain thoroughly, reserving a small amount of pasta water if desired. Set pasta aside.
02 -
In the empty pasta pot or a separate saucepan, melt 2 tablespoons unsalted butter over medium heat. Whisk in the all-purpose flour and cook, stirring constantly, for 1 minute until the mixture is smooth and bubbly.
03 -
Gradually whisk in the heavy cream, ensuring no lumps form. Add the entire Boursin cheese and grated white cheddar cheese. Stir gently until the cheeses are melted and the sauce is creamy. If the mixture is too thick, whisk in up to 1/2 cup milk until a velvety consistency is achieved. Adjust seasoning with salt to taste.
04 -
Return the cooked pasta to the cheese sauce, stirring to fully coat every piece. If needed, loosen the sauce with reserved pasta water or a splash of milk. Allow the mixture to rest for 1–2 minutes to thicken slightly.
05 -
In a small skillet over medium heat, melt remaining 2 tablespoons unsalted butter. Add plain breadcrumbs and cook, stirring frequently, until golden brown and fragrant, about 2 to 3 minutes. Remove from heat and let cool slightly.
06 -
Transfer the sauced pasta to serving bowls or a large dish. Sprinkle toasted breadcrumbs evenly over the top. Serve immediately while hot. Optionally, garnish with chopped fresh parsley for added color and flavor.