2 pastry bags; one fitted with a large round tip and the other fitted with a round tip
Preheat oven to 400 degrees F. Line a baking sheet with parchment paper.
Melt butter in boiling water in a large saucepan. Add flour and salt. Stir until mixture forms a ball, then remove from heat and transfer to mixer. Beat to cool slightly, then add eggs one at a time, mixing well after each, until smooth.
Transfer dough to a pastry bag fitted with a large round tip; pipe 2-inch puffs 4 inches apart on lined baking sheet. Bake until golden brown and puffed, about 1 hour.
Let cool completely, then split in half and remove any uncooked dough from center. Fill with Grammy's Cream Puff Filling and dust with powdered sugar.
Grammy's Cream Puff Filling:
Pour heavy whipping cream into a mixer fitted with the whisk attachment. Add powdered sugar and vanilla extract. Beat on high speed until light and fluffy, about 10 minutes. Transfer to a pastry bag fitted with a round tip.
Recipe courtesy of Grammy's Goodies, Wheat Ridge, CO