In a saucepan, combine boiling water, sugar, and salt. Stir in flour until a dough forms.

Remove from heat and let cool slightly. Beat in eggs and vanilla until smooth.

Heat vegetable oil in a large pot over medium heat.

Transfer dough to a piping bag fitted with a star tip. Pipe 4-6 inch strips into hot oil.

Fry until golden brown, about 2-3 minutes per side. Remove and drain on paper towels.

Mix sugar and cinnamon in a bowl. Roll churros in the mixture to coat.

For the chocolate sauce, heat heavy cream until simmering, then pour over chopped chocolate. Stir until smooth.

Serve churros warm with chocolate sauce for dipping.