Step 1: Prepare the Mashed Potato Mixture

In a large mixing bowl, combine the 4 cups of cold mashed potatoes, 1 ½ cups of shredded sharp cheddar cheese, ½ cup of diced ham, ¼ cup of chopped chives, the single beaten egg, ½ teaspoon of garlic powder, and ½ teaspoon of black pepper. Using a sturdy spatula or your hands, mix everything together until it is thoroughly combined. Be careful not to overmix, as this can make the potatoes gummy. The goal is a uniform mixture where all the add-ins are evenly distributed.

Step 2: The Crucial Chilling Period

Cover the bowl with plastic wrap and place it in the refrigerator to chill for at least 1 hour, or up to 4 hours. This step is non-negotiable! Chilling the mixture solidifies the fats and starches, making the potato balls much firmer and significantly easier to roll. It is the number one secret to preventing them from falling apart during the frying process.

Step 3: Shape the Potato Balls

Once the mixture is well-chilled, remove it from the refrigerator. Using a medium cookie scoop (about 1.5 tablespoons) or your hands, portion out the mixture and roll it into uniform balls, about 1.5 to 2 inches in diameter. Place the formed balls on a baking sheet lined with parchment paper. This recipe should yield approximately 24-30 potato balls. For an extra layer of security, you can place the tray of rolled balls into the freezer for 15-20 minutes to help them firm up even more before breading.

Step 4: Set Up the Breading Station

Prepare your dredging station with three shallow dishes or pie plates.

• Dish 1: Add the 1 cup of all-purpose flour.
• Dish 2: In the second dish, whisk the 2 large eggs with a tablespoon of water to create a smooth egg wash.
• Dish 3: In the final dish, spread out the 2 cups of panko breadcrumbs.
  Arranging them in this order creates an efficient assembly line.

Step 5: Bread the Potato Balls

Working with one potato ball at a time, follow this three-step process for a perfect coating:

1. Flour: Gently roll the ball in the flour, tapping off any excess. The flour gives the egg something to cling to.
2. Egg: Submerge the flour-dusted ball in the egg wash, ensuring it’s completely coated. Let any excess egg drip off.
3. Panko: Immediately transfer the egg-coated ball to the panko breadcrumbs. Roll it around gently, pressing the panko onto the surface to ensure a thick, even coating.
   Place the fully breaded potato ball back onto the parchment-lined baking sheet. Repeat with the remaining balls.

Step 6: Fry to Golden Perfection

In a large, heavy-bottomed pot or Dutch oven, pour in the neutral oil to a depth of about 2-3 inches. Heat the oil over medium-high heat until it reaches a temperature of 350-360°F (175-180°C). Using a deep-fry or candy thermometer is highly recommended for accuracy. If the oil is too cool, the balls will absorb too much oil and become greasy; if it’s too hot, the outside will burn before the inside is warmed through.

Carefully lower 4-5 potato balls into the hot oil using a spider strainer or slotted spoon. Do not overcrowd the pot, as this will cause the oil temperature to drop. Fry the balls for 2-4 minutes, turning them gently, until they are a deep golden brown and crispy on all sides.

Step 7: Drain and Serve

Once golden brown, use the spider strainer to remove the potato balls from the oil and transfer them to a wire rack set over a baking sheet. This allows air to circulate, keeping the bottoms just as crispy as the tops. Immediately sprinkle them with a little extra salt, if desired. Repeat the frying process with the remaining batches, allowing the oil to come back up to temperature between each batch. Serve hot.

Alternative Cooking Methods:

• Air Fryer Method: For a lighter version, preheat your air fryer to 400°F (200°C). Place the breaded potato balls in a single layer in the air fryer basket, ensuring they are not touching. Spray them generously with cooking oil spray. Air fry for 10-15 minutes, flipping them halfway through, until golden brown and crispy.
• Baked Method: Preheat your oven to 425°F (220°C). Place the breaded balls on a parchment-lined baking sheet. Liberally spray them with cooking spray. Bake for 20-25 minutes, turning them over at the halfway point, until they are crispy and golden. Note that the baked version will be slightly less crispy than the fried version but still delicious.