INGREDIENTS
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6 tablespoons unsalted butter, divided
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1/4 cup all-purpose flour
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2 cups whole milk
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Salt
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Pinch cayenne pepper
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1/2 cup plus 3 tablespoons freshly grated Parmigiano-Reggiano
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1/2 cup grated Monterey Jack
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1 medium yellow onion, chopped
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1 10-ounce box frozen spinach, thawed and squeezed very dry
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3 large garlic cloves, minced
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2 9-ounce boxes frozen artichoke hearts (not thawed), chopped coarse
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1 teaspoon dried thyme