INGREDIENTS
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Nonstick cooking spray
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2 tablespoons unsalted butter
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4 medium shallots, finely chopped
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6 scallions, all of the green included, sliced into thin rings
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1/2 teaspoon ground cayenne
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1/2 teaspoon freshly grated nutmeg
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2 large eggs
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1 1/2 cups whole milk
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1/2 cup heavy cream
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2 cups cooked rice
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1 tablespoon cornstarch
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1 1/2 cups grated Gruyère or Swiss, divided
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1/2 teaspoon salt, and more as needed
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1/4 teaspoon white pepper