Boil a large pot of salted water.
Add the egg noodles to the boiling water.
Cook the noodles according to package instructions until al dente.
Reserve 1 cup of pasta water, then drain the noodles.
Return the drained noodles to the pot over low heat.
Add the unsalted butter to the noodles.
Stir the noodles until the butter has melted and evenly coats them.
Gradually add reserved pasta water to achieve desired creaminess.
Season with salt and pepper to taste.
Serve hot, garnished with grated Parmesan and parsley if desired.