I use leftover mashed potatoes that I have in the fridge. Usually it's about 2-3 cups worth. I heat them in the microwave just enough to soften them up so they're easier to mix up with the eggs
while the potatoes are heating up beat 3 eggs together in a medium sized bowl.
Heat vegetable oil in large frying pan.
Mix potatoes with eggs until well blended. Toss chopped green onions in and mix.
Using a 1/4 cup size measuring cup drop potato mixture onto hot frying pan.
Cook over medium heat and when edges turn crisp and golden flip. Cook a few more minutes on other side until golden and serve.