Lightly brush the cut surface of each eggplant half with olive oil, then broil until the top is golden and fork-tender (about 5 to 6 minutes). Turn the eggplant halves over, and broil on the second side until very soft, another 5 to 6 minutes or so.
Remove the eggplant from the broiler and lower the oven rack to the second highest position.
Turn the eggplant back to its cut-side-up position, and sprinkle lightly with salt and pepper. Spread each half of the eggplant with 11/2 tablespoons tomato sauce, then spoon 11/2 tablespoons ricotta over each half in an even layer. Sprinkle each half with 11/2 tablespoons mozzarella and 1/2 tablespoon Parmesan.
Return to the broiler and cook until the cheeses are melted and have formed a lovely golden brown crust, about 5 to 7 minutes. Serve immediately, topped with a sprinkling of minced basil, if desired.
Nutrition information per serving:
Calories205Fat11 gSodium410 mg