Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper or lightly grease it to prevent sticking.
Slice the zucchinis into thin rounds, about 1/8 inch thick. Pat them dry with paper towels to remove excess moisture.
In a shallow dish or plate, combine the grated Parmesan cheese, breadcrumbs, garlic powder, dried oregano, salt, and black pepper. Mix everything together to create the coating mixture.
Dip each zucchini slice into the beaten egg, making sure both sides are coated. Press each egg-coated zucchini slice into the Parmesan and breadcrumb mixture, ensuring it is evenly coated on both sides.
Place the coated zucchini slices on the prepared baking sheet in a single layer, without overlapping. Drizzle some olive oil over the zucchini. Bake for about 15-20 minutes or until they turn golden and crispy. You may want to flip them halfway through baking for even crispiness on both sides.
Once they are done baking, remove the crisps from the oven and let them cool slightly before serving.