Altered from the late Mrs. Connie Parker’s recipe. She shared her version with me many years ago after years of bringing it to church potlucks. I roast my sweet potatoes instead of boiling them and melt the butter instead of dotting with cold butter.
Preheat oven to 400°. Place sweet potatoes on a foil-lined baking sheet. Do not poke holes in potatoes. Roast potatoes for 45 minutes to 1 hour or until a fork easily pushes to the center of the potatoes when tested, but not mushy. Let cool completely. This step can be done 3 days in advance.
Remove skins from potatoes and cut in half lengthwise; place them in an ungreased 2-quart or 13x9-inch casserole dish. Pour sugar evenly over sweet potatoes. It’s ok for it to spill over between the potatoes.
Drizzle the corn syrup over the sugar. Do not stir. Drizzle everything with butter. Bake for 40 to 45 minutes or until sugar is melted and bubbly.
If adding marshmallows, change oven to broil. Sprinkle marshmallows on sweet potatoes and broil 1 to 2 minutes or until lightly toasted.
Notes
To roast sweet potatoes in an air fryer: Place the sweet potatoes right on the rack in the air fryer. Cook at 390 degrees for 30 to 35 minutes, depending on the size of the sweet potatoes.Shortcuts:
Roasting sweet potatoes for easy peeling and added caramelized flavor is a hands-off alternative to boiling potatoes.
Sweet potatoes can be roasted up to 3 days in advance before candying them. This make ahead step saves time on the day you plan to serve them.