Peel all the potatoes.
Slice thinly using a mandolin.
Spray cooking spray on a baking dish (I used a tin foil pan)
Begin by layering with the yukon slices.
Top with a handful of all the cheeses spread over the top of the potatoes.
Pour a 1/4 cup or so of the half & half.
Take pinches of the spices and spread over the top.
Keep repeating the layering.
After 3 layers, add the sweet potato layer and continue with the cheese and the half & half and spices.
Keep going until all the potatoes have been used.
Bake in a 375 degree oven for 1 hour covered.
Remove the cover and cook for another hour uncovered.
Turn the oven up to 475 degrees and cook for 30 minutes.
You want all the cream to be absorbed.
Serve and enjoy!