Finely grate the zucchini, then squeeze out excess moisture using a towel.

In a bowl, combine drained zucchini, feta cheese, herbs, breadcrumbs, egg, garlic, salt, and pepper. Mix until sticky and firm.

Shape the mixture into balls, about 1-2 inches in diameter. Refrigerate if too wet, or add more breadcrumbs.

Preheat oven to 375°F (190°C). Line a baking sheet with parchment. Space the balls evenly on the sheet and brush with olive oil.

Bake for 20-25 minutes, flipping halfway, until golden brown and crispy.

Let cool briefly before serving with tzatziki sauce.