Once the potato skins have baked, start layering them. Spoon a bit of the caramelized onions into the bottom of each shell. Top with the sausage-potato mixture. This should mostly fill the shell. Sprinkle crumbled bacon over the potatoes, followed by cheese. Bake for another 10 minutes. Top with a dollop of the garlic sour cream and sprinkle with the scallions. Serve immediately.
Nutrition information per serving: 160 calories; 70 calories from fat (44 percent of total calories); 8 g fat (2.5 g saturated, 0 g trans fats); 20 mg cholesterol; 16 g carbohydrate; 1 g fiber; 2 g sugar; 7 g protein; 210 mg sodium.