This is the easiest possible black bean tortilla casserole that I could come up with. It is suitable for preparing ahead of time and putting in the oven with a timer. Adjust seasonings to taste.
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In a casserole pan, put a layer of corn tortillas on the bottom. Drain and rinse a can of black beans. Pour the black beans over the tortillas. Pour canned diced tomatoes over the beans. Cover with a layer of shredded mozzarella cheese. Mix the beans, tomatoes, and cheese in the pan. Cover with another layer of corn tortillas and top with salsa. Bake, uncovered, until done, about 30 to 45 minutes.