Whisk the egg in a bowl.
In a separate bowl, whisk the flour.
In a 3rd bowl, stir together the bread crumbs, panko crumbs, parsley, pepper and garlic powder.
Dip each halved mozzarella stick in the flour, shaking off any excess.
Then dip the mozzarella into the egg and the crumb mixture.
Repeat with all mozzarella.
Line mozzarella sticks on tray lined with wax paper.
Freeze 1 hour.
Preheat the oven to 400°.
Line a baking sheet with foil and lightly spray with cooking spray.
Place the mozzarella sticks on the sheet about an inch apart.
Melt the butter and drizzle over the sticks.
Bake on the middle rack for 3 minutes.
Flip and bake for 3 more minutes.
After removing from the oven, sprinkle lightly with parmesan cheese to Garnish.
Allow to cool before eating. The cheese will be hot!