Cook the Pasta

1. Boil Water: Bring a large pot of salted water to a boil.
2. Cook Pasta: Add the pasta and cook according to package instructions until al dente. Drain and set aside, reserving some pasta water.

Sauté the Mushrooms

1. Heat Oil: In a large skillet, heat the olive oil over medium heat.
2. Cook Onion: Add the chopped onion and sauté for 2-3 minutes until translucent.
3. Add Garlic: Stir in the minced garlic and cook for another minute until fragrant.
4. Add Mushrooms: Add the sliced mushrooms to the skillet and cook for about 5-7 minutes until they are tender and browned.

Make the Sauce

1. Pour in Cream: Reduce the heat to low and pour in the heavy cream, stirring to combine.
2. Add Cheese: Stir in the grated Parmesan cheese and dried thyme, mixing until the cheese has melted and the sauce is creamy.
3. Season: Season with salt and pepper to taste.

Combine Pasta and Sauce

1. Add Pasta: Add the cooked pasta to the skillet, tossing to coat the pasta evenly in the sauce.
2. Adjust Consistency: If the sauce is too thick, add a little reserved pasta water until desired consistency is reached.
3. Heat Through: Cook for an additional minute to heat everything through.