Preheat the oven to 425°F (220°C).
Line a baking sheet with parchment paper.
Place the grated zucchini in a colander and sprinkle with the salt. Let it sit for 10 minutes.
Wrap the zucchini in a clean kitchen towel and squeeze out as much moisture as possible.
Transfer the zucchini to a large bowl.
Add the egg, mozzarella, Parmesan, almond flour, garlic, Italian seasoning, garlic powder, and black pepper. Mix until well combined.
Spread the mixture into a rectangle about ½ inch thick on the prepared baking sheet.
Bake for 20 to 25 minutes until lightly golden and firm.
Meanwhile, stir together the melted butter, garlic powder, Italian seasoning, Parmesan cheese, and parsley.
Brush the garlic butter over the baked zucchini crust.
Return to the oven for another 5 to 8 minutes until the top is golden and the cheese is bubbling.
Allow the breadsticks to cool for 5 minutes.
Slice into breadsticks and serve warm with marinara sauce.