01 - Bring a large pot of salted water to a boil. Cook the pasta according to package instructions until al dente. Reserve 1/2 cup pasta water, then drain.
02 - While the pasta cooks, heat olive oil in a large skillet over medium heat. Add minced garlic and sauté for 1 to 2 minutes until fragrant but not browned.
03 - Add the spinach to the skillet and cook, stirring, until just wilted, about 2 to 3 minutes.
04 - Pour in the heavy cream. Reduce heat to low and simmer for 2 to 3 minutes, allowing the sauce to thicken slightly.
05 - Stir in the Parmesan cheese and nutmeg if using. Season with salt and pepper to taste. Mix until the cheese is melted and the sauce is smooth.
06 - Add the drained pasta to the skillet, tossing to coat in the sauce. If needed, add some reserved pasta water a little at a time to achieve a silky texture.
07 - Serve immediately, garnished with extra Parmesan and freshly cracked black pepper.