I often chuck them in when cooking something else and if it's done before them I leave baking until after dinner as they are just not precious.
If your child likes potatoes they are definitely worth a whirl. I send in a food thermos so they're hot.
Stack the deck for your child. If they like butter make them buttery. If they like cheese make them cheesy. Beans? Sour Cream? Mince?
Are jackets on your menu?