Make the Choux Pastry
In a medium saucepan, combine butter, water, sugar, and salt. Heat over medium heat until the butter melts and the mixture comes to a boil.
Reduce heat to low and add the flour all at once. Stir vigorously with a wooden spoon until the mixture forms a ball and pulls away from the sides of the pan.
Remove from heat and let cool for 5 minutes.
Transfer the mixture to a large bowl or stand mixer. Add eggs one at a time, beating well after each addition until the dough is smooth and glossy. Stir in vanilla extract.
Prepare for Frying
Heat oil in a deep fryer or heavy-bottomed pot to 350°F (175°C).
Line a baking sheet with parchment paper. Cut the parchment into small squares, one for each cruller.
Transfer the dough to a pastry bag fitted with a large star tip. Pipe rings of dough onto the parchment squares.
Fry the Crullers
Carefully place the crullers, still on the parchment squares, into the hot oil. After a few seconds, the parchment will release, and you can remove it with tongs.
Fry the crullers for 2-3 minutes per side, until golden brown and puffed.
Use a slotted spoon to transfer the crullers to a wire rack to drain and cool slightly.
Make the Glaze
In a small bowl, whisk together powdered sugar, milk, and vanilla extract until smooth and pourable.
Dip the top of each cooled cruller into the glaze, letting excess drip off.
Place the glazed crullers back on the wire rack to set.
Serve and Enjoy