Preheat oven to 375 degrees F
Line baking sheet with parchment paper or silicone mat
In a large saucepan add water, butter, salt, and sugar
Bring to a boil over medium-high heat and remove from heat
Quickly stir in flour with a wooden spoon until well combined, about 1 minute
Return pan to stove and continue cooking, stirring constantly until a film forms on the bottom of the pan
Remove from heat and transfer mixture to a large bowl, let cool slightly
Add 4 eggs, one at a time, stirring to incorporate each egg completely before adding the next egg
Make an egg wash with the remaining egg and 1 tablespoon water, whisk together and set aside
Transfer dough mixture to a large disposable decorator pastry bag fitted with a large round tip.
Pipe circle 2 inch in diameter onto parchment paper
Moisten your finger with water and gently smooth out the pointed peaks if necessary
Brush surface of cream puff with egg wash
Bake at 375 degrees F for 25-30 minutes or until puffs rise and are golden brown
Remove from oven and allow to cool completely on wire racks