In a small saucepan, bring water to a boil. In a mixing bowl, combine flour, salt, and granulated sugar. Pour hot water into the dry ingredients and stir until smooth.

Gently stir in the vanilla extract until fully incorporated. The dough should feel soft yet firm enough for piping.

Transfer the dough into a piping bag fitted with a star tip. Pipe 1-2 inch pieces onto a parchment paper.

Preheat air fryer to 375°F (190°C) for about 5 minutes. Lightly spray churros with oil and arrange in the fryer basket.

Air fry churro bites for 8-10 minutes, or until golden brown and crispy.

Mix additional sugar with ground cinnamon. Once churros are warm, roll them in the sugary mixture.