Cut your mozzarella sticks into bite-sized pieces. Place into freezer until frozen.In a small bowl, whisk the egg.
Combine flour, garlic salt and Italian seasoning and place into a bowl.In a small dish, add your panko bread crumbs.
Dip the frozen cheese bites into the flour mixture, shake off excess, then into the egg, then into the panko crumbs.Preheat oven to 400 degrees.
Line a baking sheet with foil and spray with cooking spray.Place sticks on the baking sheet, spray the tops with cooking spray.Bake for 8-10 minutes. Watch carefully so they don't melt.
Notes
If you are not going to bake these right away, place them back into the freezer until ready to bake.