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Bring a large pot of salted water to a rolling boil. Add the spaghetti and cook according to package directions until al dente. Before draining, reserve 1 1/2 cups of the pasta water. Drain the spaghetti and set aside.

While the spaghetti is cooking, heat the olive oil and butter in a large skillet or Dutch oven over medium heat.

Add the diced onion to the skillet and sauté for 3-4 minutes, until softened and translucent.
Add the sliced mushrooms to the skillet with the onions. Continue to sauté, stirring occasionally, until the mushrooms have cooked down, released their liquid, and are nicely browned, about 7-9 minutes. Season with the dried mixed herbs, salt, and black pepper to taste.

Reduce the heat to low. Add the entire package of Boursin cheese (Shallot & Chive flavor) to the skillet with the mushrooms and onions. Pour in 1 cup of the reserved pasta water.

Stir continuously until the Boursin cheese has completely melted and combined with the pasta water to form a smooth, creamy sauce. If the sauce is too thick, add more reserved pasta water, 1/4 cup at a time, until desired consistency is reached.

Stir in the freshly grated Parmesan cheese until fully incorporated and melted into the sauce.

Add the cooked and drained spaghetti to the skillet with the creamy mushroom sauce. Using tongs, toss the spaghetti thoroughly until it is evenly coated with the sauce.

Serve immediately, garnished with extra Parmesan cheese if desired.


Bring a large pot of salted water to a rolling boil. Add the spaghetti and cook according to package directions until al dente. Before draining, reserve 1 1/2 cups of the pasta water. Drain the spaghetti and set aside.

While the spaghetti is cooking, heat the olive oil and butter in a large skillet or Dutch oven over medium heat.

Add the diced onion to the skillet and sauté for 3-4 minutes, until softened and translucent.
Add the sliced mushrooms to the skillet with the onions. Continue to sauté, stirring occasionally, until the mushrooms have cooked down, released their liquid, and are nicely browned, about 7-9 minutes. Season with the dried mixed herbs, salt, and black pepper to taste.

Reduce the heat to low. Add the entire package of Boursin cheese (Shallot & Chive flavor) to the skillet with the mushrooms and onions. Pour in 1 cup of the reserved pasta water.

Stir continuously until the Boursin cheese has completely melted and combined with the pasta water to form a smooth, creamy sauce. If the sauce is too thick, add more reserved pasta water, 1/4 cup at a time, until desired consistency is reached.

Stir in the freshly grated Parmesan cheese until fully incorporated and melted into the sauce.

Add the cooked and drained spaghetti to the skillet with the creamy mushroom sauce. Using tongs, toss the spaghetti thoroughly until it is evenly coated with the sauce.

Serve immediately, garnished with extra Parmesan cheese if desired.
