INGREDIENTS
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1 (12 oz.) box spinach
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fettuccine
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1 3/4 cups 2% milk
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1 tablespoon cornstarch
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1 tablespoon all-purpose flour
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1/2 tablespoon unsalted butter
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1 small onion, finely chopped
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1/4 teaspoon kosher salt
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1/2 teaspoon pepper
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1/2 cup finely grated Parmesan cheese, plus additional for serving
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3 tablespoons finely chopped fresh parsley