Place the ground beef, egg, breadcrumbs, onion, nutmeg, and a bit of salt and pepper into a bowl and mix well. Form the beef into medium-sized balls. Heat olive oil in a pan and brown the meatballs evenly.
To begin making the sauce, remove the meatballs from the pan and add the butter. Now add the flour, which ensures thickness, and mix with the butter. Pour in the beef broth, followed by the cream and stir. Take care that the sauce does not clump.
Once thick, place the cooked meatballs into the sauce. Transfer the cooked noodles to a casserole dish and using tongs, place the meatballs on top. Next, pour the sauce over the meatballs so that they are covered. Finally, sprinkle grated cheese over the top and bake for 10 minutes at 355°F.