[header] How to make sweet potato chips [title] Heat canola oil. [step] Pour 3 to 4 cups of canola oil into a wok or deep-fryer. You may need more or less oil, depending on the size of your wok or deep-fryer. 
Just ensure that you have about 3 inches of oil in the bottom of the fryer. Heat the oil between 360 and 375 degrees f (182 to 190 c).