In a medium saucepan, combine 1 cup of water, 1/3 cup plus 1 tablespoon of unsalted butter, 1 teaspoon of salt, and 2 tablespoons of sugar. Bring this mixture to a rolling boil over high heat.

Once boiling, reduce the heat to low and add 1 cup of plain flour into the saucepan. Stir continuously until the dough forms a smooth ball.

Remove the saucepan from heat, allowing the dough to cool for about 4-5 minutes. Then, add 1 large egg and 1 teaspoon of vanilla essence to the dough, mixing until fully combined.

Transfer the churro dough into a piping bag fitted with a star-shaped nozzle.

Preheat your air fryer to 375°F (190°C) and spray the basket with nonstick spray.

Pipe bite-sized pieces of dough into the preheated air fryer basket, leaving space between each piece.

Lightly brush the churro bites with melted butter and cook for 10-12 minutes, or until golden brown.

In a mixing bowl, combine 1 cup of white sugar with 1 tablespoon of cinnamon powder. Toss the warm churro bites in this mixture.

Serve your warm Sweet Air Fryer Churro Bites immediately.