Mix the sifted flour with the sugar and salt until well combined.
In a large bowl, whisk the egg and vanilla extract together.
Add the milk and oil, and whisk until combined.
Pour the wet ingredients into the flour mixture and stir until just combined.
Pour the batter into the muffin cups and sprinkle the chocolate chips on top.
Preheat the Air Fryer to 150°C (300°F) until the heater light turns off. This should take about 3 minutes.
Place the muffin tin into the Air Fryer and bake for 30 minutes.
Remove it, and the Chocolate Chip Muffin is ready to be served.