Ingredients: 1 lb (450g) Russet potatoes 1 cup (90g) shredded cheese (like compte or gruyere) 2 Tablespoons (30g) unsalted butter 1 Tablespoon (15g) Creme Fraiche 1/4 Teaspoon grated nutmeg 6 slices of Jambon de Bayonne (substitute Prosciutto), chopped 1 Large Egg 1/2 cup (60g) all …