01 - Preheat the oven to 425°F. 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: fill the first with all-purpose flour, whisk the eggs with milk in the second, and combine the breadcrumbs, Parmesan cheese, dried oregano, garlic powder, salt, and black pepper in the third.
04 - Dredge each eggplant slice in the flour, shaking off any excess. Dip into the egg mixture to coat completely, then press firmly into the breadcrumb mixture, ensuring an even, thorough coating on all 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 using a spatula. Continue baking for another 15 minutes until both sides are golden brown and crunchy.
07 - Remove from the oven and serve immediately while hot and crispy. Pair with warm marinara sauce for dipping, or enjoy as a side dish, appetizer, or sandwich component.