4. Step
Spread 1/4 cup marinara in a medium ovenproof skillet. Arrange about 4 or 5 eggplant slices, slightly overlapping, in a single layer to cover the sauce. Spoon 1/2 cup marinara over the eggplant and top with 1/2 cup bean mixture and 1/4 cup ricotta, spreading the layers evenly over the eggplant. Repeat with another layer of eggplant, marinara, bean mixture and ricotta. Top with the remaining eggplant slices, marinara and mozzarella. Cover with foil and bake until the sauce is bubbly and the cheese is melted, about 30 minutes. Remove the foil and bake until the cheese is slightly browned, 10 minutes more. Sprinkle with crushed red pepper, if desired.