Prepare the choux batter:
Preheat the oven to 400 F and line two sheet pans with a parchment paper.
In a medium non-stick pot combine water with salt and bring to a boil.
Add butter and bring to a boil one more time.
Add flour and whisk vigorously until no lumps remain and the batter thickens, about 1 minute.
Remove pot from the heat and let the batter cool for 5 minute.