Preheat the oven to 425°F and line a baking sheet with parchment paper.
Grate the zucchini through the large holes of a box grater.
Wrap the zucchini in a clean kitchen towel and squeeze firmly until as much moisture as possible is removed.
Combine the zucchini, base mozzarella, Parmesan, egg, Italian seasoning, salt, and garlic powder in a large bowl.
Spread the mixture on the prepared baking sheet into an even layer about 1/2 inch thick.
Bake for 15 minutes, until the base is set.
Top with the remaining mozzarella and bake for 5 minutes more, until melted.
Let the baked zucchini stand for 3 to 4 minutes, then cut it into breadsticks and serve.