In a large mixing bowl, combine potatoes, olive oil, and seasoning for the potatoes. Toss well until the potatoes are evenly coated.
Grease the bottom tray of the air fryer with non-stick cooking spray.
Place potatoes inside the air fryer, covering the bottom tray completely. Cook at 400°F for 18-20 minutes, shaking halfway through.
While the potatoes are cooking, prepare the ranch dip by combining all of the ingredients in a small mixing bowl.
Using a fork, mix the ingredients until fully blended and smooth. Cover and refrigerate until ready to use.
When the potatoes are done, transfer them to a serving dish and serve the potatoes alongside homemade ranch dipping sauce.