1. Combine water, sugar, and butter in a saucepan and bring to a boil.
2. Remove from heat, add flour and salt, and stir until a dough forms.
3. Mix in the egg until smooth.
4. Pipe the dough into churro shapes and fry in hot oil until golden brown.
5. Drain on paper towels, then fill one end with chocolate hazelnut spread using a piping bag.
6. Serve warm and enjoy
