Preheat the air fryer to 400°F (200°C) as directed by your air fryer.
Place cubed sweet potatoes in a bowl. Add melted butter and mix well.
Sprinkle in salt, cayenne, ginger, and sugar. Stir to evenly coat.
Arrange in a single layer in the air fryer basket.
Air-fry for 10–12 minutes, shaking halfway through cooking.
Serve warm and enjoy.
