Make the Churro Dough:

In a medium saucepan, combine water, sugar, butter, and salt. Bring to a boil over medium heat, stirring until the butter melts.

Add the Flour:

Remove from heat and add the flour all at once. Stir vigorously until the dough forms a ball and pulls away from the sides of the pan.

Incorporate Wet Ingredients:

Let the dough cool for 5 minutes. Add the egg and vanilla extract, mixing until smooth and fully combined.

Heat the Oil:

Heat vegetable oil in a deep frying pan or pot to 375°F (190°C).

Pipe and Fry the Churros:

Transfer the dough to a piping bag fitted with a large star tip. Pipe 4–5-inch strips of dough directly into the hot oil, cutting with scissors. Fry 3–4 churros at a time, cooking for about 2–3 minutes per side until golden brown.

Coat the Churros:

In a small bowl, mix the granulated sugar and cinnamon. Roll the warm churros in the mixture until fully coated.

Serve and Enjoy:

Serve your Cinnamon Churros warm with your favorite dipping sauce, such as chocolate or caramel.