Wash and grate the zucchini. Wrap in a towel and squeeze out excess moisture. Set aside.

In a mixing bowl, combine zucchini, feta, egg, breadcrumbs, and optional oats. Add parsley, garlic, oregano, salt, and pepper. Mix until combined.

Form the mixture into golf ball-sized balls and place them on a plate.

Preheat oven to 180°C (350°F). Line a baking sheet with parchment paper and arrange balls evenly. Drizzle olive oil on top.

Bake for 20 minutes, flipping halfway through until golden brown.

Allow to cool for a few minutes before serving with tzatziki sauce or your favorite dip.