spray cooking spray on the bottom of your baking dish so they don't stick.
Peel and thinly slice turnips and onions - its best if you have a mandolin - they need to be thin.
In a separete bowl - combine your philly and cream and add your spices - you can jazz these taters up with garlic and some heat or you can just go plain with salt and pepper- whisk these ingredients together as best you can to combine the philly and cream.
lay a layer of turnip on the bottom - followed by a layer of onions followed by a layer of cheese - then continue until you have used all your ingredients. make sure you end with turnip on the top.
Pour your cream mixture gently over the top- wiggle your layers around so that the moisture gets down to the bottom and all through the ingredients. If you think there should be a little more cream - by all means add more. Top off with a sprinkle of what ever spices you are using (salt, pepper, garlic, mixed seasonings etc).
bake for 1 1/2 hours or until a fork goes through the tatoes easily -.