INGREDIENTS
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1 container (15 ounces) ricotta cheese
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1 egg
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1 package (8 ounces) shredded mozzarella cheese, divided
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1 jar (28 ounces) spaghetti sauce
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1/2 pound (1/2 of a 16-ounce box) uncooked lasagna noodles
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1 box (10 ounces) frozen chopped spinach, thawed and drained
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2 cups sliced fresh mushrooms
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1 cup water, divided