Roasted Sweet Potato and Black Bean Chili

lbs sweet potatoes ((about 3 medium), peeled and cut into small cubes)

Salt and pepper

olive oil (, divided)

medium yellow onion (, chopped (1 1/2 cups))

red bell pepper (, cored and diced)

garlic (, minced)

vegetable broth (, then more as desired)

fire roasted diced tomatoes

ear corn (, husked and kernels cut from cob (or 1 cup frozen corn))

ancho chili powder ((or more to taste))

ground cumin

black beans, drained and rinsed

Cilantro (, lime wedges, diced avocado, sliced roasted jalapeños, sour cream, cheddar or Mexican blend cheese)