Preheat the oven to 425 degrees.
Line two rimmed baking sheets with parchment paper.
Wash and cut the potatoes into medium slices and place them in a bowl. Do not peel the potatoes.
Add the olive oil to the potatoes and stir to coat (I use my hands).
Sprinkle with the coarse salt and mix to combine. Grind a bit of black pepper into the mixture.
Place the potatoes on the prepared pans. The slices should not overlap.
Bake for 20 minutes, then flip over the potatoes and bake an additional 20 minutes.
Prepare the bacon while the potatoes are cooking. I cheat and use precooked bacon, so I just heat it in the microwave according to the package directions.
Chop the bacon into medium pieces.
Spray a baking dish with non-stick cooking spray.
Arrange the cooked potatoes in the dish. These can overlap. I didn't have any particularly nice dishes, so I used a medium sized, rectangular glass pan.
Sprinkle the cheddar over the potatoes and return to the oven until the cheese melts, about 5 minutes.
Remove from the oven and sprinkle the surface with the cooked bacon pieces.
Chop the green onion and sprinkle over your nachos.
Finish with a dollop of sour cream.