Preheat your oven to 425 degrees. Line a baking sheet with foil.
Toss the potato rounds in the olive oil and season with salt and pepper. Place on the baking sheet in a single layer. Bake in the preheated oven for 10 minutes. Flip and continue baking for an additional 5-10 minutes, depending on how thin your rounds are.
Pile the cooked potato rounds onto an oven safe serving dish (or pile them right up on the baking sheet) and sprinkle with the shredded cheese. Return to the oven for 3-5 minutes, or until cheese is melted. Remove from the oven and top with the crumbled bacon, sour cream, and green onions.
Use a mandolin to easily slice the potatoes! This makes a thinner round, but the prep much easier. The cook time will depend on the thickness of your potatoes. I like to cook mine until they are crispy and thin, like potato chips! I like to mix herbs into my sour cream. In the picture above, I mixed in a little dried dill and dried thyme. Yum!