Saute onions in butter. Prepare potatoes according to directions, add 2 ... noodles) then 1/4 potato mixture. Continue layering 4 layers. ... minutes or until hot.
Crumble 3 slices not-too-soft white bread (if you have no day-old bread, leave fresh bread ... 2 cups leftover mashed potatoes and 1 egg yolk. Beat ... carefully into the potato mixture. Drop by small spoonfuls ... and fry until brown.