"This spinach gratin recipe features spinach, onions, cream, and bread crumbs. Spinach au gratin...."
INGREDIENTS
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1 small onion, finely chopped
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1 tablespoon olive oil
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2 tablespoons all-purpose flour
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3/4 teaspoon salt
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1/4 teaspoon ground black pepper
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1/4 teaspoon dried thyme, crushed
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2 pounds spinach, rinsed, drained, and chopped
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1 cup whole milk
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1/2 cup heavy cream
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3 tablespoons butter, melted
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1 cup bread crumbs
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1/4 cup Parmesan cheese