Yes you can re heat your eggplant parmesan easily. Oven Method (Preferred): Preheat your oven to around 350°F (175°C). Place the desired portion in an oven-safe dish. Cover the dish with aluminum foil to prevent the top from drying out. Reheat for about 15-20 minutes or until it's heated through. Microwave Method: If you're short on time, you can use a microwave. Place a microwave-safe cover over the dish or use microwave-safe plastic wrap, leaving a small vent for steam. Reheat in 1-minute intervals, checking and stirring between each interval until it's hot all the way through.