In a Dutch oven, saute sweet potato and red pepper in oil until pepper is crisp-tender. Add garlic; cook 1 minute longer. Add tomatoes, broth, beans, brown sugar, chili powder, salt and pepper. Bring to a boil. Reduce heat; simmer, uncovered, 15-20 minutes or until potatoes are tender., Meanwhile, preheat oven to 400°. Prepare cornbread batter according to package directions; stir in cheese. Drop by tablespoonfuls over chili. , Cover and bake 18-20 minutes or until a toothpick inserted in center comes out clean. Serve with toppings of your choice.