01 - Preheat the oven to 425°F (220°C). Line two baking sheets with parchment paper and lightly coat with olive oil spray.
02 - Wash the eggplants thoroughly and slice into 1/2-inch thick rounds. Optionally, sprinkle the slices lightly with salt and let them rest for 15 minutes to draw out excess moisture, then pat dry with paper towels.
03 - Arrange three shallow bowls for breading: fill the first with all-purpose flour, whisk the eggs and milk together in the second, and combine the breadcrumbs, Parmesan cheese, oregano, garlic powder, salt, and black pepper in the third.
04 - Dredge each eggplant slice in the flour, shaking off excess. Dip into the egg wash, allowing any surplus to drip off. Press firmly into the breadcrumb mixture, coating both sides evenly.
05 - Place the coated slices in a single layer on the prepared baking sheets. Lightly drizzle or spray the tops with olive oil for even browning.
06 - Bake for 15 minutes, then carefully flip each slice. Continue baking for another 15 minutes until the coating is golden brown and crunchy.
07 - Serve immediately while hot and crispy as a side dish, appetizer, or alongside warm marinara sauce for dipping.