Peel the potatoes, making sure you get the white off. Slice them in 1/2 inch rounds.
Mix together your sugar and spices. Set aside.
Place your potato slices to form a single layer, sprinkle 1/2 of your SnS mix and vanilla over top, take 1/2 of your butter in lil pats over top and zest 1/2 of your orange over that. Repeat that. Then squeeze your orange juice over the whole thing, watching for seeds.
Bake covered for roughly an hour and a half,give them a stir, sit for 5 minutes and enjoy!