Wash and scrub the sweet potatoes; pat them dry with a paper towel.
Carefully slice each sweet potato ⅛-inch slits (or slices) along the tops, stopping ½-inch from the bottom (1 centimeter). Be careful not to apply too much pressure or you may cut straight through.
Drizzle some oil or butter and salt and pepper over the cut sweet potatoes.
Prepare the basting oil mixture by whisking together oil, smoked paprika, lemon juice, and maple syrup.
Place sweet potatoes on an air fryer rack or basket in single layer, making sure to leave some space between them and not stacking them.
Cook at 375 degrees Fahrenheit for 18-20 minutes (depending on the size of your sweet potatoes), flipping over halfway through the cooking time.
Once the potatoes are fork-tender, remove them from the air-fryer. Brush the oil-smoked paprika-lemon-maple syrup mixture on each sweet potato. Make sure to coat well the inside of the cut sweet potato.
Serve warm with your desired garnishes. Enjoy.