Peel the potatoes, rinse them, and grate them on the small holes of a box grater into a large bowl.

Transfer the grated potatoes onto a fine mesh strainer or clean kitchen towel and squeeze out as much liquid as possible, then return the potatoes to the bowl.

Grate the onions on the small holes of the grater and add them to the potatoes.

Add the eggs, flour, salt, and pepper to the bowl and mix thoroughly until the mixture is thick and uniform.

Preheat the air fryer to 400°F. Cut a piece of parchment paper to fit the basket and cut several small holes in it, then place it in the basket and lightly brush with vegetable oil.

Spoon the potato mixture onto the prepared parchment, forming flat pancakes about 1/4 inch thick, leaving space between them so they do not touch.

Air fry the pancakes at 400°F for 20 to 25 minutes, then carefully flip each pancake with a silicone spatula or tongs.

Continue air frying for another 20 minutes, or until the pancakes are deep golden brown and crisp around the edges.

Remove the pancakes from the air fryer and repeat with the remaining batter, serving the placki hot.