This was so simple and good! My husband and I agree that we will try it next time with some minced garlic on it, too.
Preheat oven to 200 C (400 F). Wash an eggplant and slice it lengthwise. Brush the cut surface with olive oil. Place into an oiled baking dish. Sprinkle with salt, pepper, and thyme. Roast for half an hour.