Preheat the oven to 425°F and line a baking sheet with parchment paper.
Place the grated zucchini in a clean towel and squeeze out as much water as possible.
In a bowl, combine the zucchini, egg, 1/2 cup mozzarella, Parmesan, flour, garlic powder, Italian seasoning, salt, and pepper.
Mix until the batter looks thick and evenly combined.
Spread the mixture into a thin rectangle on the baking sheet.
Bake for 15 minutes, then top with the remaining mozzarella.
Bake again until the cheese is melted and the edges are golden.
Let rest for a few minutes before slicing into breadsticks and serving warm.