The average number of eggs for this choux pastry recipe is 4. However, it's super important to not add more liquid to the dough than it can handle.  How many eggs you need depends on several different factors, such as climate and altitude, humidity, the brand of flour you are using, if the flour was too tightly packed when you measured it, and how large each of the eggs are. The best way to control the amount of eggs you add to the dough is to whisk them all together and then add them to the dough bit by bit, stopping when the dough is thick and shiny and can hold its shape.