Heat a large skillet over medium heat. Cook and stir ground bison in the hot skillet until browned and crumbly, 5 to 7 minutes. Place cooked bison in a slow cooker. Add chili beans, diced tomatoes, onion, bell pepper, cumin, chili seasoning, cayenne pepper, garlic powder, and paprika; mix to combine. Cook on Low, 6 to 8 hours. Meanwhile, bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally, until tender yet firm to the bite, about 8 minutes. Drain the macaroni and add to the chili in the slow cooker for the last 20 minutes of cooking.