Peel the green plantains by cutting off the ends and making a shallow lengthwise slit along one of the ridges. Use a paring knife to remove the tough skin carefully.

Set your air fryer to 350 degrees F (177 degrees C) and allow it to preheat for a few minutes.

Cut the plantains into 1-inch pieces and place them in a mixing bowl. Toss with 2 tablespoons of avocado oil to coat evenly. Arrange the plantain pieces in a single layer in the air fryer basket. Air fry at 350 degrees F (177 degrees C) for 10 minutes until slightly golden and softened.

Use a tostonera or the back of a drinking glass to gently mash the plantains into flat disks. If they stick, carefully separate them with a paring knife.

Return the tostones to the mixing bowl and coat them with the remaining 2 tablespoons of avocado oil. Place them back in the air fryer basket in a single layer. Air fry at 350 degrees F (177 degrees C) for an additional 5 to 7 minutes until golden and crispy.

Remove the tostones from the air fryer and season immediately with garlic salt or your preferred seasoning while still hot. Serve with your favorite dipping sauce.