Start by preheating your oven to 400 degrees and spray a large baking pan with non-stick spray.
Wash, scrub and dry your potatoes and then slice your potatoes about 1/4 of an inch thick.
Add your potato slices to a large mixing bowl and add the olive oil and spices. Toss to combine before moving them to your baking pan and laying your potato slices in a single layer. I usually use two 13×9 cookie sheets or one large jelly roll pan.
Bake your potatoes for 20 minutes, flip the slices over and then bake for another 20 minutes.
Take your potatoes out of the oven and set your oven to Broil. Transfer your potato slices to a large oven-safe skillet or casserole pan. Lay your potatoes in a single layer then top with shredded cheese, bacon and green onions. Add a second layer of potatoes and toppings and continue until you have used up all of your potatoes.
Once you have completely covered your potatoes, pop them back in the oven for 2-3 minutes or until your cheese has melted.