Preheat oven to 400°F (200°C). Rub potatoes with olive oil and place them on a baking sheet.
Bake for about 1 hour, or until fork-tender. Remove from oven and let cool slightly.
Cut each potato in half lengthwise and scoop out the insides, leaving a thin shell.
In a bowl, mash the scooped-out potato with sour cream, milk, butter, cheddar cheese, garlic powder, onion powder, salt, and pepper.
Spoon the mixture back into the potato shells and top with extra cheese and crumbled bacon.
Bake again at 375°F (190°C) for 15-20 minutes until cheese is melted and golden brown.
Garnish with chopped green onions and serve warm.