Heat the oil in a large pot or Dutch oven over medium heat. Add the onion and bell pepper, and cook, stirring occasionally, until the vegetables are soft, about 6 minutes. Stir in the jalapeno and garlic and cook until they soften slightly, about 1 minute.
Stir in the chili powder, cumin, oregano, 1/2 teaspoon salt and a few grinds of pepper. Add the turkey and stir until well coated in the spices. Pour in the tomatoes and chicken broth and scrape up any spices that may have stuck to the bottom of the pan. Bring the chili to a simmer on medium-low and cook, uncovered, on until the liquid has reduced by a few inches and the chili has thickened, about 1 hour.
Drain and rinse one of the cans of beans; leave the bean liquid in the second can. Add all the beans plus the reserved bean liquid to the pot and heat until the beans are warmed through, about 10 minutes. Season to taste with more salt and pepper. Serve in bowls over potatoes or rice with a dollop of sour cream and sprinkle of chopped scallions.
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