Place whisked eggs in a small bowl. Place 2 cups of breadcrumbs in another small bowl. Pour oil into pan being used for frying (pour in enough oil so it is at least 1-inch dip). Heat oil at medium-high on the stove. Once the oil is hot enough for frying, reduce to a medium heat.
Take a spoonful of mashed potatoes, roll into a ball about the size of a ping pong ball. Gently roll in egg and then roll in breadcrumbs. Roll again in egg mixture and again in breadcrumbs. Put into the oil. Fry for a few minutes, turning over as needed until all sides are a dark golden brown. If the coating turns brown too fast, reduce heat further so that the balls have enough time in the hot oil to heat the mashed potatoes all the way through. Repeat with remaining mashed potatoes. If you run out of breadcrumbs, add another cup.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.