No, there is no need to soak sweet potatoes before cooking them in the air fryer. The key to a crispy air fried sweet potato cube is showing restraint when adding olive oil (or the cooking oil of your choice) to the cubes and making sure you don’t overcrowd the air fryer basket. As mentioned earlier, some overlapping is acceptable, but our goal is to fry and not steam, so air circulation is a critical component. Plus, cubes are small with greater exposed surface area, so achieving a crispy texture is actually a little easier than their sweet potato fry counterparts.