Preheat an air fryer to 400 degrees F (200 degrees C).
Meanwhile, place potatoes in a microwave-safe bowl: cook on high until just tender, about 5 minutes.
Transfer potatoes to a baking sheet and use the bottom of a small glass to gently "smash" them to ¾ or ½-inch thick. The thinner you flatten the potatoes, the crispier they will be.
Brush melted butter over the tops of smashed potatoes. Season with salt, garlic powder, and pepper.
Place potatoes in the basket of the air fryer in an even layer; cook until golden and crisp, about 10 minutes. Garnish with parsley and serve hot.
