Combine water, 75g butter, salt, and 25g sugar in a pot and bring to a rolling boil over high heat.

Reduce heat, add flour, and stir vigorously until a smooth dough forms and pulls away cleanly from the pan sides.

Transfer the dough to a mixing bowl and let it cool for about 4-5 minutes so it doesn't cook the egg.

Add the egg and vanilla extract, then beat with an electric mixer until the dough is completely smooth and ready for piping.

Set the air fryer to 375°F (190°C) and spray the basket generously with non-stick spray for easy release.

Squeeze bite-sized churro shapes into the air fryer basket, ensuring they aren’t crammed together for maximum crispiness.

Lightly brush the churros with melted butter, then cook for 10-12 minutes until they're beautifully golden brown and delightfully crisp.

In a shallow bowl, mix together the 200g sugar and 8g cinnamon powder for that irresistible classic flavor.

Immediately toss the hot churro bites in the cinnamon sugar mixture, using a little extra melted butter or spray to help it adhere perfectly.

Enjoy these delectable bites right away, perhaps with your favorite dipping sauce for an extra special treat!