Half potatoes and boil in large pot of salted water until fork-tender, about 15 minutes.
Drizzle half of the olive oil onto a baking sheet. Drain potatoes and place onto baking sheet. Using a potato masher, flatten potatoes to about 1/2-3/4 inch thick. Brush tops with remaining olive oil and sprinkle with salt and pepper.
Bake at 400 degrees for 20 minutes.
Remove from oven, sprinkle with cheese and bacon and return to oven for another 5 minutes to melt the cheese. Top with sour cream and green onions and serve.
Slightly adapted from Express Lane Cooking by Shawn Syphus.