Thoroughly scrub the potatoes under water and pierce them several times with a fork. Place on a baking sheet and roast in a preheated 400°F oven for approximately 40 minutes, or until the flesh is fully tender.
Allow the baked potatoes to cool slightly, then slice each one in half lengthwise. Carefully scoop out the interior, leaving a sturdy shell intact.
Fry or bake the bacon until crisp, then crumble or chop into small pieces.
Brush the inner and outer surfaces of the potato shells with olive oil. Sprinkle evenly with salt, black pepper, and garlic powder.
Arrange the shells in an air fryer at 400°F and cook for 20 minutes, or bake in the oven at the same temperature for 20 to 30 minutes, until golden and crisp.
Remove and sprinkle the insides generously with shredded cheddar cheese and chopped bacon. Return to the air fryer or oven briefly, just until the cheese has melted.
Finish with a garnish of fresh green onions and serve immediately with a side of sour cream.