Preheat oven to 425F. Line 2 cookie pans with parchment paper.
Sift the flour and cocoa powder together. Set aside
Place the water, butter, salt, and sugar in a pan and over the stove, high heat.
Allow the butter to melt, and the water starts to boil. Add the flour mixture.
Vigorously mix the flour and water until a smooth dough forms and the bottom and sides of the pan are clean. Reduce heat to medium-low and keep mixing for additional 1-2 minutes.
Remove from heat and place in a bowl of a standing mixer. Using the paddle attachment, mix the dough on medium for 3-4 minutes, or until cool to the touch.
Add the eggs one at a time and mix on medium until you have a smooth batter. The batter will go from a very messy, curdle mixture to a smooth and sticky dough.
Use a cookie spoon; piping bag or two spoons to scop the dough over the prepared pans.
Bake for 10 minutes then reduce the heat to 400F and baker for 10-15 minutes longer.
Once it is baked, turn the oven off and allow the profiteroles to cool in the oven.