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Preheat oven to 400 degrees
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Brown your ground beef and Italian sausage. If the sausage is in links, take off the casings to brown.
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Add your pasta sauces and simmer for 10 minutes and let cool.
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In the meantime slice one zucchini lengthwise using a mandolin. And slice the other zucchini to make thin round circles.
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In a mixing bowl add your ricotta, spinach and egg yolk and mix well.
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Spray a large muffin tin with cooking spray.
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Place a circle slice of zucchini in each cup. Then add one or two long slices around the sides of the muffin cups.
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Add a pinch of mozzarella cheese in each zucchini cup.
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Next a spoonful ricotta mixture and then a spoon of meat sauce.
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Add another round slice of zucchini.
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Add layers of ricotta and sauce and then top with a large spoonful of shredded mozzarella.
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Bake for 25 minutes or until the cheese is brown and bubbly.
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Let set for 10 minutes and serve.