Choux pastry is a delicate pastry used in many confectionery products. The main ingredients usually include only butter, water, flour and eggs (auxiliary ingredients and flavorings are also added). Instead of baking powder, choux pastry uses a high moisture content to generate steam as the water in the pastry evaporates during baking, making the pastry fluffy. This dough is used in many European cuisines, including French and Spanish, and is the basis of many famous desserts, including profiteroles, eclairs and churros.