Preheat the oven to 425°F (220°C). Pierce potatoes several times with a knife; arrange them on a large baking sheet.
Bake until tender, about 45 minutes. Cool.
Slice potatoes in half; scoop out flesh (reserve for another use). Leave a 1/4-inch shell.
Brush inside and outside potato halves with oil; season with salt and black pepper.
Arrange potato halves on the baking sheet. Bake until crisp and golden brown, about 10 minutes, turning once.
Spoon chili into potato shells; top with cheese.
Bake until cheese is melted, 3 to 5 minutes.
Top with sour cream and green onions.
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