2 large eggplanats (1 to 1 ¼ pounds each), sliced lengthwise ¾ inch thick
3 tablespoons olive oil, plus more for baking dish
Coarse salt and freshly ground pepper
1 container (15 ounces) part-skim ricotta cheese
(1 2/3 cups)
3 large eggs
1 cup grated Parmesan cheese
2 tablespoons chopped fresh oregano (or 2 teaspoons dried)
1 jar (16 ounces) store-bought marinara sauce (2 cups)