In your pot on medium heat, pour the water, place the butter, add sugar and whisk well until it starts boiling
Once the mixture reaches boiling point, remove the pot from heat, pour in the flour and mix vigorously until the dough starts forming
Once the dough is formed (it does not stick anymore to the side of the pot), pour it in a separate mixing bowl
Start adding the eggs one by one, whisking every time, and once you add the third egg, check for the consistency of your pâte à choux. It should not be hard, but not liquid either, meaning once you remove your whisk, the mixture should fall of it gently
If you do not get that consistency after 3 eggs, beat the 4th egg in a separate bowl, add half of it and mix. If you still do not get the texture, add the rest of it and whisk and you should be good
In a pastry bag, add your pâte à choux and start making small oval shaped dough balls on a parchment paper on a baking tray. Make sure to allow some space between them as they will expand in the oven
Preheat your oven at 215 degrees Celsius (419 degrees Fahrenheit) with convection on. Brush your prebaked profiteroles with the remaining egg wash or milk to give them a golden color.
Place your baking tray in the oven and let your pâte à choux bake for 20 minutes or until golden brown
Remove the baking tray and using a skewer, poke holes on the top of each profiterole piece, and place them back in the oven for 5 minutes at 150 degrees Celsius (302 degrees Fahrenheit) with convection on
Place them on a cooling grid and back in your cold oven overnight, allowing them to dry