Leftover mashed potatoes aren't very good if you just reheat them and serve them as is. You have to add something to them to make them flavorful. Potato patties are a great way to use up this ingredient to make another recipe that is crisp, hot, and delicious. This easy recipe is loved by everyone.23 minsPrep: 15 mins,Cook: 8 minsYield: 6 servingsWhat You'll Need- 2 cups cooled mashed potatoes- 1 egg, beaten1 onion, minced- 1/4 cup flour- 1/2 cup grated Parmesan cheese- 1/4 teaspoon salt- 1/8 teaspoon white pepper- 2 tablespoons olive oil- 2 tablespoons butterHow to Make It1. Mix together the mashed potatoes, beaten egg and onion in a medium bowl. Add the flour, cheese, salt and pepper and stir well with a wooden spoon.2. In a large nonstick skillet over medium heat, heat the olive oil and butter together until the butter melts and the mixture starts to sizzle.3. Drop about 1/4 cup of the potato mixture into the frying pan, patting it into 3-inch circles that are about 1/2" thick. Cook the potato patties until the bottom is browned and crisp, which will take about 3 to 4 minutes.4. Carefully turn each patty over with a spatula and cook the second side until it is brown and crisp, about 3 to 4 minutes longer. Remove the patties from the pan and drain briefly on paper towels Serve the patties immediately with ketchup or salsa or any other sauce you'd like.for further information and detail tutorial, download this application now and you will have what you want.please enjoy this tutorial and give us any feedback.