Preheat the oven to 400 F. Cut string cheese sticks in half. In a shallow dish, whisk egg and milk together. Place flour in another shallow dish. Combine breadcrumbs and Italian seasoning in another dish.
Dip each cheese stick in the egg mixture, roll in the flour, dip back into the egg mixture, and fully coat in the breadcrumbs. Place onto plates. Freeze for at least one hour.
Place mozzarella sticks on a large greased baking sheet. Bake for 20-25 minutes.