Heat the olive oil over medium heat in a large pot or Dutch oven.
Add the diced onion and bell pepper. Sauté for about 5 minutes, until the vegetables are softened.
Stir in the minced garlic and cook for an additional minute, until fragrant.
Add the black beans, pumpkin puree, diced tomatoes (with juices), and vegetable broth to the pot. Stir to combine.
Season the mixture with chili powder, cumin, smoked paprika, salt, and black pepper. Stir well.
Bring the chili to a gentle simmer. Reduce heat to low and let it cook for about 20 minutes, stirring occasionally.
In the last 5 minutes of cooking, stir in the corn until heated through.
Taste and adjust seasoning if necessary. Serve hot, garnished with chopped cilantro and lime wedges if desired.