In a saucepan over medium heat, bring water and butter to a boil. Add flour all at one. stir until a smooth ball form. Remove from heat, let stand for 5 minutes. Add the eggs, one at a time, beating well after each addition. Beat until smooth. Spread into greased baking dish. Bake at 400 for 30-35 minutes or until puffed and golden brown. Cool completely on a wire rack.