Remove the mozzarella string cheese from the wrappers and lay them on a baking pan.
Freeze the cheese sticks for about 30 minutes or so, until hard (keeps them from blowing up in the oven)
In one bowl, crack the egg and whisk. In another bowl, add the breadcrumbs.
Spray a large baking sheet with nonstick cooking spray, or double up and cover your baking sheet with foil and then spray with nonstick cooking spray.
Dip your frozen cheese sticks first in the egg, then roll to coat with the breadcrumbs. I actually re-dip mine so I can make sure they are covered in enough breadcrumbs. If you decide to do this, just re-dip in the egg and then re-roll in the breadcrumbs a second time. Repeat the process for each remaining cheese stick, placing them on the baking sheet.
Send the sticks back to the freezer for about 20 minutes.
Remove from freezer and pop pan in oven. Bake at 400 degrees for about 5 minutes, flip the cheese sticks over and bake for an additional 4-5 minutes. Don't walk away at this point. Watch them. Remove when you see cheese bubbling. Serve immediately and Enjoy!
Notes
Air Fryer Instructions: Preheat Air Fryer to 390 degrees F. If sticks are frozen, 4-6 minutes. If sticks are not frozen, 2-4 minutes.