Drain the sliced potatoes and lightly pat them dry. Set aside.
Cut the kielbasa into ¼-inch wide slices. Chop the bell peppers and onion.
Place the potatoes, kielbasa, peppers, and onions in a bowl and spray them lightly with cooking oil.
Add seasoning salt and pepper and carefully toss together until all the ingredients are coated.
Pour the kielbasa mixture into the air fryer basket and air fry at 400°F for 7 minutes.
After 7 minutes, shake the air fryer basket, then continue to air fry for an additional 7 minutes.