Bring water and butter to a boil. Stir in flour until blended. Remove from heat. Add eggs, one at a time, beating well after each egg (use electric mixer). Whip until smooth. Drop large tablespoon onto ungreased cookie sheet. Bake at 400 degrees for 35-40 minutes. Will brown right away, don't take out early. Cool; slice tops. Remove any filament; fill and dust with powdered sugar.

Makes 12.