Place a small pot on medium heat.
Add boiling water and butter.
Bring to a boil.
Stir thoroughly.
Add in flour all at once.
Mix to fully incorporate the flour, breaking any small flour pockets.
Remove the formed flour ball from heat.
Set aside for at least 15 minutes to cool down.
Preheat the oven to 400°F.
Add one egg to the cooled flour ball.
Mix until there is no sign of the egg yolk or egg white.
Repeat for each additional egg.
Scoop or pipe the choux pastry onto a buttered or parchment-lined tray.
Bake for 30 to 40 minutes at 400°F or until there is no more moisture on the puffs.
Remove and set aside to cool.
Slice the lower end of the puff to add filling.