Instructions:

1. In a large bowl, combine the leftover mashed potatoes, shredded cheddar cheese, chopped green onions, all-purpose flour, and beaten egg.
2. Season the mixture with salt and pepper to taste. The cheese will add a salty kick, so be mindful of the additional salt.
3. Mix the ingredients thoroughly until well combined. The mixture should hold together easily.
4. Heat vegetable oil in a skillet over medium heat.
5. Scoop a portion of the potato mixture and form it into a patty. Place it gently in the hot skillet. Repeat with the remaining mixture, making sure not to overcrowd the pan.
6. Fry the potato cakes for 3-4 minutes on each side or until golden brown and crispy.
7. Once cooked, transfer the potato cakes to a plate lined with paper towels to absorb any excess oil.
8. Serve the potato cakes hot, perhaps with a dollop of sour cream or your favorite dipping sauce.

Enjoy the delightful crunch and creamy interior of these Potato Cakes – a fantastic way to reinvent your leftover mashed potatoes and add a touch of flair to your meals. Bon appétit!