Aunt Margie's Sweet Potato Pone

Preheat oven to 325 degrees F (165 degrees C).

Mix sugar, butter, egg, cinnamon, salt, and nutmeg together in a bowl. Stir in sweet potatoes, orange zest, and orange juice until evenly incorporated. Pour mixture into a shallow 9x13-inch baking dish.

Bake in the preheated oven until cooked through and bubbling, 1 hour. Serve hot or cold.