Bring water to a boil in a large pot
Remove from heat and add the melted butter and vanilla extract.
In another bowl combine the sifted flour, baking powder, and salt.
Pour the liquid into the dry ingredients and quickly mix to a sticky, soft dough.
Let it rest for 15 minutes.
Combine sugar and cinnamon in a small bowl.
Fill a piping bag with the churros dough.
Heat the oil in a wok to 190C.
Squeeze out the dough through the piping bag in long pieces and drop them into the oil - fry for a minute until golden.
Take them out with a sieve and let them dry on paper towels. Sprinkle the cinnamon mixture and fry the rest of the batter in batches.
Serve with the chocolate sauce and dulce de leche.