INGREDIENTS
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6 ounces dry lasagna noodles
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1 pound uncooked Italian sausage links
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1 medium yellow onion, finely chopped
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2 14.5-ounce cans diced tomatoes, or 3 1/2 cups chopped fresh tomatoes
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1/2 cup chicken stock
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1 tablespoon Italian seasoning
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15 ounces ricotta cheese
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11 ounces fresh baby spinach (one large clamshell case or bag)
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2 cups shredded mozzarella cheese, divided
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1/2 cup grated Parmesan cheese