In a large bowl, combine the mashed potatoes, egg, cheese, flour, green onions and salt and pepper to taste.
Scoop about ⅓ cup of the mixture. Then roll it into a ball and flatten it out with the palm of your hands. The mixture will make about 6-8 pancakes.
Preheat a large skillet with the olive oil and cook the pancakes in two batches.
Cook for 4-5 minutes per side, or until the pancakes are golden brown. Transfer to a paper towel-lined plate and season with salt and pepper while they’re hot.
Serve with greek yogurt or sour cream and green onions, if desired
Notes
Storage: You can make the mix for your mashed potato pancakes a day or two ahead or time and keep it covered in the fridge until you are ready to cook. Cooked pancakes will keep well for around 4 days in the fridge.Reheat: Cooked pancakes can be reheated in the oven at 360F.Tip: Season your mashed potato to taste before frying.