Preheat oven to 450 degrees F. Line a baking sheet with non-stick aluminum foil.
Place melted butter in a bowl. Combine bread crumbs and salt in a separate bowl. Dip eggplant slice in the butter and then in breadcrumb mixture.
Place each prepared eggplant slice in a single layer on the prepared baking sheet.
Spoon and spread the marinara sauce on top of each eggplant slice, sprinkle with oregano, and then sprinkle with Mozzarella cheese.
Bake approximately 10 to 12 minutes or until tender.
Notes: I like to use young eggplant, and I do not peel them. I brush butter all over the skin (olive oil works just as well). I also like to use my homemade roasted Marinara Sauce, which is a very concentrated and flavorful sauce.
Roasted Eggplant with Marinara Sauce Recipe: https://whatscookingamerica.net/KarenCalanchini/RoastedEggplantMarinara.htm