Instructions: Preheat oven to 425 degrees F. In a medium bowl, combine the flour with the salt, black pepper, thyme, and cayenne. Set aside. In a large saucepan, combine the milk and the butter. Bring to a boil over high heat. Remove the pan from the heat when the butter melts and add the seasoned flour all at once. With a wooden spoon, stir vigorously just until the dough masses into a ball and does not cling to the sides of the pan. Transfer the dough to a large mixer bowl. On medium speed, beat in the eggs, one at a time. Stir after each addition until the egg is completely absorbed. Continue this process until 4 of the eggs have been used. The dough should be smooth and satiny. Add the Parmesan and Gruyere cheeses to the dough and beat in thoroughly. Spoon 2 teaspoons of dough about 1" in diameter onto buttered baking sheets, setting the puffs about 1 1/2" apart. Beat the remaining egg and, with a pastry brush, lightly brush the tops to glaze. Bake for 10 minutes, rotating the baking sheets halfway through, until the puffs reach a rich golden brown. Let cool slightly. Serve immediately.

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