Preparation: Begin by peeling the plantains. Using a sharp knife or a paring knife, slice off the ends of the plantain and make a shallow cut along the , green skin.
Slice the Plantains: Cut the plantains into slices about ½ inch thick.
Toss with Oil: Place the plantain slices in a large bowl. Add a teaspoon of oil (avocado, coconut, or a light spray of olive oil) and a little salt. Toss the plantains gently to ensure each slice is lightly coated.
Air Frying: Spray the air fryer basket with cooking spray and arrange the plantain slices in a single layer in the air fryer basket or on the air fryer rack, ensuring they're not overlapping. This might require cooking in batches, depending on the size of your air fryer. Set the air fryer to 375°F (190°C) and cook for 10-12 minutes, flipping the slices halfway through, until they are golden brown and have begun to caramelize. The exact time might vary, so it's a great idea to start checking a little bit early to prevent burning.