01 - 
                In a saucepan over high heat, combine water, butter, salt, and sugar. Bring to a boil, then reduce the heat to low.
              
              
              
                02 - 
                Gradually add the flour, stirring continuously until the dough forms and pulls away from the sides of the pan. Remove from heat.
              
              
              
                03 - 
                Transfer the dough to a mixing bowl and let it cool for 4-5 minutes. Once slightly cooled, add the egg and vanilla extract. Use an electric hand mixer to blend until smooth.
              
              
              
                04 - 
                Transfer the dough into a piping bag fitted with a star tip. Preheat the air fryer to 375°F and lightly spray the basket with nonstick cooking spray.
              
              
              
                05 - 
                Pipe small bite-sized churros into the air fryer basket, leaving space between them. Brush the tops with melted butter and air fry for 10-12 minutes, or until golden brown.
              
              
              
                06 - 
                In a shallow bowl, mix sugar and cinnamon. Toss the warm churro bites in the mixture until fully coated. If needed, brush with melted butter before rolling in the sugar mixture.
              
              
              
                07 - 
                Enjoy warm with chocolate sauce, honey, or Nutella for dipping!