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 flour, whisk the eggs and milk together in the second, and combine the breadcrumbs, grated Parmesan, dried oregano, garlic powder, salt, and black pepper in the third.
04 - Dredge each eggplant slice through the flour, shaking off any excess. Dip into the egg mixture to coat completely, then press firmly into the seasoned breadcrumb mixture, ensuring an even, thorough coating on both sides.
05 - Place the breaded slices in a single layer on the prepared baking sheets. Drizzle or spray the tops lightly with olive oil to promote browning and crispness.
06 - Bake for 15 minutes, then carefully flip each slice and continue baking for an additional 15 minutes until both sides are golden brown and crunchy.
07 - Remove from the oven and serve immediately while hot. Pair with warm marinara sauce for dipping, or serve as a side dish or appetizer.