1. 1. In a medium saucepan, combine water, butter, 1 tbsp sugar, and salt. Bring to a rolling boil over medium heat, ensuring butter melts and sugar dissolves.

2. 2. Remove from heat and add flour all at once. Stir vigorously with a wooden spoon until a smooth dough ball forms, pressing against pan sides for 30-60 seconds. Transfer to a large bowl.

3. 3. In a deep pot, heat 4-6 cups oil to 375°F (190°C) using a deep-fry thermometer.

4. 4. Fit a piping bag with a large star tip (e.g., Wilton 1M). Fill with dough.

5. 5. In a shallow dish, mix 1/2 cup sugar and 1 tbsp cinnamon for coating.

6. 6. Pipe 4-6 inch strips of dough into hot oil, cutting with scissors. Fry in batches (4-5 at a time) for 2-4 minutes per side until golden brown. Maintain oil temperature.

7. 7. Remove with tongs, drain on paper towels, then immediately roll in cinnamon sugar.

8. 8. For chocolate sauce: heat heavy cream until simmering, pour over chocolate chips in a bowl, let sit 2 minutes, stir until smooth. Add vanilla if desired.

9. 9. Serve churros immediately with warm chocolate sauce.