Turn on your oven at 200 degrees Celcius.
Bring water and butter to a boil in a saucepan.
When the liquid boils, add all the flour at the same time. Stir vigorously now, I like to use a wooden spoon. Stir around over low heat until the dough gathers and becomes glossy and releases the bowl. Then it needs to get off the heat fast!
Now let the dough cool down. Meanwhile, whisk the eggs together in a bowl.
Put the dough in a mixer with a whisk or use an electric whisk. Add about 1 egg at a time, and whisk the dough well after each egg. In the end, the dough should be quite sticky but still smooth and even. See the consistency we are looking for in the picture here.
Now put the choux pastry in a piping bag with a round tip. Pipe out small tops on a baking sheet lined with baking paper.
Bake the choux buns for about 25 minutes in the middle of the oven. Avoid opening the oven for the first 20 minutes. When the time is up and they are golden, take one of the buns out and see if it collapses when you place it on the kitchen table. If it collapses, the baking time must be extended. If it does not collapse, you can take the rest out of the oven.
Place the choux pastry buns on a rack and let them cool down while you prepare the cream.