Preheat your air fryer to 400°F (200°C) for about 3-5 minutes.
Start by peeling the plantains and cutting them into 3 or 4 pieces crosswise.
To peel the plantains easily, trim about 1/4” off each end, then carefully slice the skin down one side without cutting into the fruit itself.
Gently pry the peel off with your fingers once you’ve slit one side.
Lightly coat the plantain pieces with vegetable oil.
Place the plantain pieces in the air fryer basket in a single layer, making sure they’re not overcrowded.
Cook in the preheated air fryer for about 10-12 minutes, flipping halfway through, until they’re tender and lightly golden.
Remove from the air fryer and let them cool slightly.
Once cooled, flatten the baked plantains by placing them one at a time between two pieces of parchment paper and pressing down gently with your hands until they’re about 1/4” thick.
Place the flattened plantains back in the air fryer basket and cook for an additional 5-7 minutes, flipping halfway through, until they’re crispy and golden brown.
Remove from the air fryer, sprinkle with salt, and serve immediately.
For an extra special touch, top the air-fried patacones with a thin slice of queso blanco (salty white cheese) before serving.