Add cold macaroni and cheese to a large bowl. Add the shredded cheese and mix it together. (Using your hands makes this job easier).
Scoop out mac and cheese and roll together to create a 2 inch ball and lay it on the prepared baking sheet.
Repeat the process with the remaining macaroni.
Add the flour, salt, pepper, onion powder and garlic to a shallow dish. Stir to combine.
In a separate shallow dish, add the eggs and beat them until smooth.
In a third shallow dish, add the seasoned panko breadcrumbs.
Take each macaroni ball and roll it first in the flour.
Next, dip the ball into the beaten egg and allow the excess to drip off.
Then roll the ball into the breadcrumbs covering all areas.
Set the ball back onto the baking sheet.
Repeat this process with the remaining balls.
Cover and freeze for at least 30 minutes.