Prep the oven and pan: Preheat the oven to 425°F (220°C). Line a baking sheet with parchment paper for easy cleanup.
Slice the eggplant: Cut the eggplant into 1/2-inch rounds.
Try to keep them even so they cook at the same rate.
Salt and rest (optional but helpful): Sprinkle the slices lightly with salt and let them sit for 10–15 minutes to draw out moisture. Pat dry with paper towels. This helps reduce sogginess.
Season and oil: Place slices on the baking sheet.
Brush both sides with olive oil and season with salt, pepper, and garlic powder.
Roast the eggplant: Bake for 15 minutes, flip, and bake another 5–8 minutes until tender and lightly browned around the edges.
Add sauce and cheese: Spoon a thin layer of marinara on each slice. Top with mozzarella, a sprinkle of Parmesan, and Italian seasoning.
Add toppings: Keep it simple to avoid weighing down the slices. A few pepperoni slices or a small handful of olives or sautéed mushrooms works well.
Bake until melty: Return to the oven for 6–8 minutes, until the cheese is bubbling and slightly golden.
For extra browning, broil for 1–2 minutes—watch closely.
Finish and serve: Let cool for a couple minutes, then garnish with fresh basil or red pepper flakes. Serve warm.