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Chop both ends off of each zucchini.
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Slice each zucchini length-wise into 4-5 slices (about 1/5-inch thick)
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In a baking dish, assemble 4-5 tightly aligned zucchini slices as your base.
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Spread 1/2 cup of tomato sauce, and lightly add ricotta and mozzarella cheese (portion it out so there is enough for 3 layers)
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Add 4-6 onion rounds on top.
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Repeat the layers twice.
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Top off with the remaining zucchini slices. Lightly spread what’s left of the tomato sauce, sprinkle some mozzarella cheese, and finish off with grounded black pepper (optional).
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Bake @400F for 60-70 min. Enjoy!