Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper.
Cut the potatoes in half lengthwise and place on the baking sheet. Drizzle with olive oil and season with salt and pepper.
Flip potatoes cut-side down and prick each one a few times with a fork. Brush tops with more olive oil and season again with salt and pepper.
Bake cut-side down for 25 minutes, or until cooked through. Flip and let cool slightly.
Scoop out the insides, leaving about ¼ inch of potato around the edges.
Brush the skins with olive oil and season with salt, pepper, and garlic powder.
Bake cut-side down for 10 minutes, then flip and bake for 5 minutes, until crisp.
Sprinkle with cheddar cheese and bake for 4 to 5 minutes, until melted.
Serve with chopped green onions and sour cream.