Slice potatoes thin - mandoline slicer works best, but you can also do it by hand

Drizzled slices with olive oil to coat & sprinkle on salt, pepper, and garlic salt.  Be generous, depending on thickness of slices

Place slices on cooking sheet & bake at 400 degrees for 30-40 minutes, or until slices are cooked through.  Flip them halfway through baking.  

Once potatoes are done, transfer to smaller baking dish, layering potatoes, chicken, cheese and bacon bits.  Repeat until potatoes are gone.

Place dish back in the oven for 5-7 min, or until cheese is melted.

Top with sour cream & green onions (and any other topping choice) and serve!