Christmas Croquembouche

Preheat oven to 425 °F. and butter and flour 2 baking sheets. Spoon pâte à chou into a large pastry bag fitted with a 1/2-inch plain tip and pipe about 55 mounds onto baking sheets, each about 1 1/2 inches in diameter, leaving 1 1/2 inches between mounds. With a finger dipped in water gently smooth pointed tip of each mound to round puffs. Bake puffs in upper third of oven 10 minutes, switching position of sheets in oven halfway through baking if necessary. Reduce temperature to 400 °F. and bake puffs 20 minutes more, or until puffed and golden. Let puffs stand in turned-off oven 30 minutes. Transfer puffs to racks to cool. With a skewer poke a 1/4-inch hole in bottom of each puff. Puffs may be made 2 days ahead and kept in an airtight container. Recrisp puffs in 400 °F. oven 5 minutes and cool before filling.