Line a baking sheet with parchment paper.
Set up a dredging station: one bowl with flour, one with beaten eggs, and one with a mix of breadcrumbs, Parmesan, garlic powder, oregano, salt, and pepper.
Roll each mozzarella piece in flour, dip into the egg, then coat in the breadcrumb mixture.
Place coated sticks on the baking sheet and freeze for at least 30 minutes.
Preheat oven to 400°F (200°C).
Bake frozen mozzarella bites for 12–15 minutes until golden and crispy.
Serve hot with marinara sauce.