Heat oven to 400 degrees. Line two sheet trays with parchment paper.
In a saucepan, bring water, butter and salt to a full boil.
Remove from heat. Add flour all at once and stir vigorously.
Return pan to medium heat and cook for 1-2 minutes, until the dough pulls away from the sides and a light film forms on the bottom.
Transfer dough to a bowl and cool for 1-2 minutes.
Add eggs one at a time, mixing thoroughly after each addition, until smooth and glossy.
Fold in cheese, herbs and black pepper until evenly incorporated.
Pipe or scoop 1- to 1 1/2-inch mounds onto prepared trays.
Bake 20-25 minutes, until puffed and deep golden. Do not open the oven during baking.
Turn off oven, crack the door and let them rest for 5 minutes. Serve warm.