In 2-quart saucepan, heat 1 cup water, the butter and 1/4 teaspoon salt to boiling over medium-high heat. With wooden spoon, stir in flour. Reduce heat to low; beat vigorously about 1 minute or until mixture forms a ball. Remove from heat. Beat in 1 egg at a time, beating vigorously after each addition until mixture is smooth and glossy. Drop dough by 1/4 cupfuls, 3 inches apart on cookie sheet, forming 12 mounds.