Boil the potatoes, peel them, and mash well.
Add flour, salt, and egg to the mashed potatoes and knead into dough.
Roll the dough into long ropes, then cut into bite-sized pieces.
Drop the gnocchi into boiling water and scoop them out when they float to the top.
Melt butter in a pan and pour in heavy cream.
Add the gnocchi and Parmesan cheese, tossing them gently in the cream sauce.
Season with salt and pepper to taste.
Serve on a plate and garnish with parsley.