Preheat oven to 425°F (220°C). Line a baking sheet or pizza pan with parchment paper.
Shred zucchini and place in a clean kitchen towel. Squeeze out as much moisture as possible.
In a large bowl, combine zucchini, mozzarella cheese, Parmesan cheese, egg, garlic, Italian seasoning, salt, and pepper.
Spread mixture evenly onto prepared baking sheet into a rectangle about ¼-inch thick.
Bake for 15–18 minutes until edges become golden brown.
Mix melted butter with minced garlic and brush over baked zucchini base.
Sprinkle remaining mozzarella cheese on top.
Return to oven for 5–7 minutes until cheese is melted and bubbly.
Allow breadsticks to cool slightly before slicing.
Garnish with parsley and serve warm with dipping sauce.