Prepare the Dough: In a medium saucepan, combine water, butter, and salt. Bring to a boil over medium heat, stirring until the butter is melted.

Add Flour: Remove from heat and add the flour all at once. Stir vigorously with a wooden spoon until a smooth dough forms and pulls away from the sides of the pan.

Incorporate Eggs: Transfer the dough to a mixing bowl. Let it cool for a few minutes. Add the eggs one at a time, mixing well after each addition until the dough is smooth and glossy. The dough should be thick but pipeable.

Prepare for Air Frying: Transfer the dough to a piping bag fitted with a large star tip. Preheat your air fryer to 375°F (190°C). Spray the air fryer basket with vegetable oil spray.

Pipe the Churro Bites: Pipe 1-inch pieces of dough into the air fryer basket, leaving some space between each bite. You may need to work in batches.

Air Fry: Air fry for 8-10 minutes, or until golden brown and crispy.

Coat with Cinnamon Sugar: While the churro bites are air frying, combine the sugar and cinnamon in a shallow dish.

Coat and Serve: Immediately after removing the churro bites from the air fryer, toss them in the cinnamon sugar mixture until evenly coated. Serve warm and enjoy!