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: place the flour in the first bowl, whisk the eggs with milk 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 mixture, then press firmly into the seasoned breadcrumb mixture, coating both sides evenly.
05 - Place the breaded slices in a single layer on the prepared baking sheets. Lightly drizzle or spray the tops with olive oil.
06 - Bake for 15 minutes, then carefully flip each slice and continue baking for another 15 minutes until both sides are golden brown and crispy.
07 - Serve immediately while hot, paired with marinara sauce for dipping, or as a side dish, appetizer, or sandwich component.