"This creamy, comforting side dish wonderfully rounds out any holiday dinner. Just a little of this rich casserole goes a long way. —Jennifer Bley, Austin, Texas..."
INGREDIENTS
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3 packages (9 ounces each) fresh baby spinach
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1 small red onion, chopped
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1 tablespoon butter
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1 package (8 ounces) cream cheese, cubed
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1 cup (8 ounces) sour cream
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1/2 cup half-and-half cream
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1/3 cup plus 3 tablespoons grated Parmesan cheese, divided