Grate russet potatoes and onion using the large holes of a box grater into a mixing bowl. Wrap the mixture in a clean kitchen towel and squeeze firmly for 3 minutes until no more liquid comes out.
4 medium russet potatoes, 1 medium onion
Mix dried grated potatoes with salt and black pepper. If using fresh herbs, mix them in now. Shape the mixture into 4 flat patties about ½ inch thick and 4 inches wide using your hands.
1 tsp salt, 0.5 tsp black pepper, optional tbsp fresh herbs
Preheat the air fryer to 375°F for 3-5 minutes. Spray the air fryer basket with vegetable oil spray to prevent sticking.
as needed vegetable oil spray
Place patties in the basket with 1-inch gaps between them. Spray the tops with oil spray. Cook for 7-8 minutes until edges are golden brown and crispy.
as needed vegetable oil spray
Carefully flip patties using a spatula. Spray the second side with oil spray. Air fry for another 7-8 minutes until both sides are crispy and deep golden brown. Let rest for 2 minutes before serving.
as needed vegetable oil spray