Line a 9x13 baking dish with parchment paper.

Whisk together 2 ½ cups of flour with the powdered sugar and salt, then pour in the melted butter and mix until combined.

Sprinkle the dough into your lined pan and press down into a flat layer. Bake in the air fryer at 350°F (180ºC) for about 10 min or until a light golden color.

Add the sugar to a big bowl and add the zest of three lemons. Mix until the zest is fully incorporated and sugar is a light yellow color.

Add the sugar and remaining half cup of flour to a large bowl and mix well.

Pour in the lemon juice and add the eggs then mix very well until completely combined.

Pour the filling onto the warm crust then transfer to the oven and bake in the air fryer for about 12 minutes, turning halfway through the bake.

Remove from the air fryer and allow to cool for an hour before chilling in the refrigerator for two hours.

Cut into bars using a clean, sharp, damp knife. Clean and re-wet the knife after each cut.

Serve and enjoy your lemon bars!