Slice sweet potato into 1/8 to 1/4 inch about 3/4 of the way into the potato, being careful not to cut all the way through.
Brush with olive oil trying to get in between the slices. Reserve any remaining oil.
Bake for 30 minutes.
Remove from the oven and separate slices slightly with a knife to get them to fan out a bit. Brush again with remaining oil, or just to spread out the oil that is already there using the knife to help you get it in between the slices better.
Return to the oven and continue baking for an approximately 30 more minutes or until done.
Recipe by From Calculu∫ to Cupcake∫ at https://www.fromcalculustocupcakes.com/hasselback-sweet-potatoes/