Preheat oven 400 (I used convection setting at 400)
Place the water, butter, salt and sugar in a pot and cook over medium, stir occasionally.
Once it hits a boil, remove the pot from the heat and stir in the flour with a wooden spoon. Once combined and forming a ball (1 min) return the pot to medium heat and cook for 2-3 mins while stirring. (A film on the pot developing is good)
Place dough in mixer and let run a few minutes to remove all of the steam.
Slowly add eggs while mixing and continue to run mixer until the dough leaves lines as it spins. When picking up the beater the batter should form a v off of the bottom.
Place dough in a 14 inch pastry bag with a 1/2 inch french star tip.
Pipe slowly at a 45 degree angle touching the silpat or parchment. (I now prefer parchment) This helps keep them wide and not too skinny. Each eclair should about 5 inches.
Dust with powdered sugar.
Bake 20-25 mins and check them. You can prick the sides with a toothpick to release steam.
Continue baking until golden-approx 5-10 more mins but keep eye on them.
Let cool 10 mins on tray then move to a rack.
Slice and fill.