Slice the zucchini into 1/4-inch slices. Set aside.
In a wide, shallow bowl, combine the panko breadcrumbs, grated parmesan, garlic powder, black pepper, kosher salt, and cayenne pepper.
Put the flour in a second bowl and the beaten eggs in a third.
Coat the zucchini slices in flour, then the beaten eggs, and finally coat them in the breadcrumbs mixture. Place on a sheet of parchment paper in a single layer.
Heat the oil in a frying pan over medium-low heat. Carefully add coated zucchini slices to the hot oil (you may need to work in batches depending on the size of your pan).
Cook for 6-8 minutes, or until golden, flipping halfway through. Some slices may take longer to cook so remove them as they are ready.