01 - Preheat oven to 400°F. Line two baking sheets with parchment paper.
02 - Arrange eggplant slices on baking sheets, brush both sides lightly with olive oil, and sprinkle with salt and pepper. Roast for 18 to 20 minutes, turning once, until tender and pliable. Remove and let cool slightly.
03 - Lower oven temperature to 375°F.
04 - In a medium bowl, combine ricotta, Parmesan, mozzarella, egg, basil, parsley, garlic, nutmeg, salt, and pepper until thoroughly mixed.
05 - Spread 1 cup of marinara sauce evenly over the bottom of a 9x13-inch baking dish. Place 2 to 3 tablespoons of ricotta filling on one end of each eggplant slice and roll it up tightly. Arrange rolls seam-side down in the baking dish.
06 - Spoon remaining marinara sauce over the rolled eggplant slices, then sprinkle with remaining mozzarella and Parmesan cheeses.
07 - Cover the baking dish with foil and bake for 20 minutes.
08 - Remove foil and bake for an additional 10 to 15 minutes until the sauce bubbles and cheese is golden.
09 - Allow to rest for 5 minutes before serving. Garnish with fresh basil leaves if desired.