In a large dutch oven, heat up the olive oil and sauce the onion and bell peppers together until onion is translucent and softened, about 7-10 minutes. Add the garlic and cook another minutes. Stir in the beer. Let it simmer about 5-7 minutes. Puree the 1/4 cup chipotle peppers with 1/2 cup of the canned tomatoes until smooth. Add to the dutch oven with the rest of the canned tomatoes, beans, broth, and tomato paste. Stir in the cumin and oregano. Bring to a simmer and cook for 25-30 minutes or until thickened. Serve with toppings of your choice.