Heat oven to 425°F. Prick potatoes all over, rub with a little oil and a pinch of salt, and set on a rack.
Bake potatoes 50–60 minutes until skins are crisp and centers yield to a squeeze.
Warm remaining oil in a large pot over medium heat. Sauté onion and bell pepper until softened, about 5 minutes.
Add turkey. Cook, breaking it up, until lightly browned and no longer pink, 5–7 minutes.
Stir in garlic, chili powder, cumin, paprika, oregano, cayenne, salt, and pepper. Cook 30 seconds until fragrant.
Mix in tomato paste and cook 1 minute, stirring.
Pour in crushed tomatoes and broth. Add beans. Simmer 15–20 minutes, stirring occasionally, until thickened. Adjust seasoning.
Split potatoes lengthwise and fluff with a fork. Spoon chili over each, then top with cheddar, sour cream, and green onions.