Prepare the Batter:

1. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking powder, salt, and cinnamon (if using).
2. Combine Wet Ingredients: In a separate bowl, whisk the egg, milk, and vanilla extract until well combined.
3. Combine Wet and Dry: Gradually add the wet ingredients to the dry ingredients, whisking until a smooth batter forms. The batter should be thick but pourable.

Fry the Funnel Cake Sticks:

4. Heat the Oil: In a deep frying pan or skillet, heat about 2 inches of vegetable oil to 350°F (175°C). Use a thermometer for accuracy.
5. Pipe the Batter: Transfer the batter to a piping bag fitted with a large round tip, or use a resealable plastic bag with a corner snipped off.
6. Fry in Batches: Pipe 4-5 inch sticks of batter into the hot oil, being careful not to overcrowd the pan. Fry until golden brown, about 1-2 minutes per side.
7. Drain the Sticks: Remove the fried sticks with a slotted spoon and place them on a plate lined with paper towels to drain excess oil.

Dust and Serve:

8. Dust with Sugar: Generously dust the funnel cake sticks with powdered sugar while they are still warm.
9. Add Dipping Sauces: Serve alongside your favorite dipping sauces, such as chocolate, caramel, or fruit preserves.