Prepare sweet potato by either 1. baking at 425 for 45-55 minutes and removing sweet potato from the skin, or 2. Peel and chop sweet potatoes into chunks. Bring a large pot of water to a boil and add sweet potatoes, cooking for about 15 minutes, until fork-tender. Drain water and mash potatoes, then set aside to cool. I placed my sweet potatoes in my food processor and blended/pureed them until no chunks were visible.