INGREDIENTS
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1 tablespoon olive oil
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1/2 sweet onion, minced
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2 garlic cloves, minced
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6 cups spinach
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1 3/4 cups whole-milk ricotta cheese
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24 jumbo shells
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3 cups marinara sauce
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1 1/2 cups shredded mozzarella cheese
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1/2 cup grated Parmesan cheese
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Chopped fresh basil, as needed for serving
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Chopped fresh parsley, as needed for serving