01 - Bring a large pot of salted water to a boil. Cook pasta according to package directions until al dente. Reserve ½ cup of the cooking water before draining.
02 - Heat olive oil in a large skillet over medium heat. Add minced garlic and cook for 1–2 minutes until fragrant, taking care not to brown it.
03 - Add chopped spinach to the skillet and cook for 2–3 minutes, stirring constantly until completely wilted.
04 - Reduce heat to low. Pour in heavy cream and stir to combine. Let simmer gently for 2 minutes.
05 - Stir in grated Parmesan, salt, pepper, and nutmeg. Continue stirring until cheese is fully melted and sauce achieves a smooth consistency.
06 - Add cooked pasta to the skillet and toss thoroughly to coat. If sauce appears too thick, gradually incorporate reserved pasta water until reaching desired consistency.
07 - Plate the pasta while hot. Garnish with additional grated Parmesan and fresh parsley if using.