Preheat oven to 350° F
In sauce pan combine butter, salt, water and bring to boil.
Remove from heat and add flour and stir until mixture thickens an is dough like.
With an electric hand-mixer on low beat dough and add eggs 1 at a time mixing completely,
Add the vanilla and mix well in to dough.
Dough should look like mashed potatoes but feed sticky.
Put dough into pastry bag or plastic bag with corner cut off.
Squeeze slender lines of dough into rows leaving at least an inch in between each row. Each line of dough should be about 4 inches long.
Bake for 15 to 18 minutes or until they are deep golden brown.
Remove the cookie sheet and sprinkle cinnamon-sugar over the warm churros.