In a saucepan, heat the milk, butter, salt, pepper, and nutmeg over medium heat, until scalded. Add the flour all at once and beat it vigorously with a wooden spoon until the mixture comes together. Cook, stirring constantly, over low heat for 2 minutes. The flour will begin to coat the bottom of the pan. Dump the hot mixture into the bowl of a food processor fitted with the steel blade. Immediately add the eggs, Gruyere, and Parmesan and pulse until the eggs are incorporated and the dough is smooth and thick
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Spoon the mixture into a pastry bag fitted with a large plain round tip. Pipe in mounds 1 1/4 inches wide and 3/4-inch high onto the baking sheets. With a wet finger, lightly press down the swirl at the top of each puff. (You can also use 2 spoons to scoop out the mixture and shape the puffs with damp fingers.) Brush the top of each puff lightly with egg wash and sprinkle with a pinch of Gruyere. Bake for 15 minutes, or until golden brown outside but still soft inside
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