Place the potatoes in a large bowl and toss with the olive oil. Add the sea salt, smoked paprika, and black pepper and toss again until evenly coated.
Lightly spray the air fryer basket with avocado oil. Add the potatoes and air fry at 400°F for about 20 minutes, shaking the basket after 10 minutes and again after another 5 minutes.
Check the potatoes for doneness. They should be golden and crispy on the outside and tender when pierced with a fork. If needed, continue air frying for a few more minutes.
Serve immediately for the crispiest texture.
Notes
Cut the potatoes into evenly sized pieces so they cook at approximately the same rate.
Air fryers vary, so use the cooking time as a guide. The potatoes are done when they're golden and crisp on the outside and tender when pierced with a fork.
Avoid overcrowding the air fryer basket. If you're making a large amount, cook the potatoes in batches.