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Preheat your oven to 350F.
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Line a large baking pan with foil backed parchment paper.
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In a large skillet, sauté the onions.
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Add the burger, sausage, and garlic.
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Sauté meat until it is browned and cooked all the way through (if using lean meat do not drain).
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Add pasta sauce and Italian seasoning. Add salt and pepper to taste.
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Let the tomato and meat sauce simmer on low until you are ready to assemble the lasagna.
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Next, stir together the ricotta, eggs, heavy cream, fresh thyme, and spinach. Add salt and pepper. Stir until well combined.
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To assemble the lasagna apply ingredients in this order:
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1/3 tomato/meat sauce (on bottom)
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Layer of noodles
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Thick layer of ricotta mixture
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1/4 of shredded cheese
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Layer of noodles
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1/3 tomato/meat sauce
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1/4 of shredded cheese
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Layer of noodles
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Thick layer of ricotta mixture
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1/4 of shredded cheese
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Layer of noodles
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Any leftover ricotta
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1/3 tomato/meat sauce
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All remaining shredded cheese
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Cover with foil and bake for 30 minutes. Uncover and bake for another 30 minutes. Let rest for at least 20 minutes. Slice and EAT!