Potato Rosti with Bacon and Brie

lbs russet potatoes

salt

feshly ground black pepper

large egg, lightly beaten

cornstarch, or use all-purpose flour

slab bacon without the rind, or thick cut bacon

wheel of Brie or any other good melting cheese you like. Great with cheddar!

bunch green onions, sliced, dark ends saved for garnish

oil, for frying