"A fluffy savory version of a cream puff. No filling required!..."
INGREDIENTS
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1 cup water
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1/2 teaspoon kosher salt
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1/2 cup unsalted butter, cubed
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1 cup all-purpose flour
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4 eggs
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1/4 teaspoon ground black pepper
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A pinch of nutmeg
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1 cup grated gruyere cheese, plus extra for topping