1. Heat the olive oil in a large skillet over medium-high heat.
2. Add the onion and garlic and cook until softened, about 5 minutes.
3. Add the bell pepper and jalapeno and cook for an additional 3 minutes.
4. Stir in the chili powder, cumin, salt, and pepper and cook for 1 minute.
5. Transfer the mixture to the slow cooker.
6. Add the diced tomatoes, black beans, kidney beans, corn, tomato sauce, and vegetable broth.
7. Cover the slow cooker and cook on low for 6-8 hours or high for 3-4 hours.
8. Serve with your favorite toppings.