Add the pasta and enough water to cover it. Bring to a boil and cook according to package instructions.
Once the pasta is almost done, stir in the spinach and heavy cream.
Cook until the spinach wilts and the sauce thickens, about 2-3 minutes.
Stir in the cheese until melted and creamy. Season with salt, pepper, and optional red pepper flakes.
Serve
Serve it straight from the pan for a cozy dinner or plate it up with a sprinkle of extra cheese on top. Perfect with a side of garlic bread!