INGREDIENTS
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5 tablespoons butter, divided
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1 sweet onion, finely chopped
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1 garlic clove, minced
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1/4 cup all-purpose flour
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1 1/2 cups whole milk
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1/2 cup heavy cream
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1/4 teaspoon nutmeg
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Salt and freshly ground black pepper
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2 heads cauliflower, cut into bite-size florets
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1 cup grated Gruyère cheese
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3/4 cup grated Parmesan cheese