To a large bowl, add the potatoes, cheddar cheese, green onions and bacon. Mix until combined.
Scoop the potato mixture into 1 1/2 inch balls and set on a plate. Press a jack cheese cube into the middle of each ball, and form the potato around it. Chill for 15 minutes.
Beat the egg in a small-medium bowl. In another medium bowl, add the bread crumbs, parmesan, salt and pepper.
Add oil to a deep fryer or medium sized pot, it should be a depth of nearly 3 inches. Heat to 375°F.
One by one, using tongs if available, dip each mashed potato ball in the beaten egg and then dredge in bread crumbs. Place on a plate and set aside.
When the oil is hot, use a slotted spoon to gently add 3-4 balls into the pot. Fry for 2-3 minutes gently moving them around to brown evenly. Remove to a paper towel lined plate.
Repeat for remaining balls. Serve with your favorite dipping sauces and enjoy!
