Preheat the oven to 400 degrees Fahrenheit. Coat a 9 or 8 inch (I used 8 x11 inch) pan or 2-quart baking dish with olive oil or butter.
Arrange the sweet potatoes in a single layer within the prepared dish.
In a small bowl, combine the brown sugar, melted butter, cinnamon, salt, nutmeg, orange juice, orange zest, vanilla, maple, and ginger.
Whisk them together until well blended.
Pour the candied mixture evenly over the sweet potatoes. Gently toss the sweet potatoes to ensure they are thoroughly coated in the flavorful sauce.
Bake the sweet potatoes for a span of 45-50 minutes, pausing to stir every 15-20 minutes. Test the sweet potatoes for doneness, they should be firm yet fork-tender. After baking, allow the yams to rest for a few minutes. This helps the flavors meld and the textures settle. They should become even more tender and acquire a delightful caramelized finish. Enjoy!
Optional: How to add marshmallows. After baking, sprinkle the marshmallows over the top of the tender sweet potatoes. Return the dish to the oven and bake for an additional 5 minutes, or until the marshmallows are melted and have taken on a golden brown hue. Serve right away!