Bring butter, sugar, salt, and ¾ cup water to a boil in a 3-qt. saucepan over medium-high heat, stirring occasionally. Immediately remove from heat, and quickly stir in flour mixture all at once.
Return to heat and stir with a wooden spoon for 1 to 2 minutes, or until dough is smooth and forms a ball. Transfer dough to the bowl of an electric mixer, and let cool 5 minutes.