On the stovetop, heat up a large pot to medium high heat, add oil, garlic, onion, and peppers. Saute vegetables until fragrant, about 5 minutes.
While vegetables are cooking, cut the chicken breast into small chunks, about 1 1inch. Add chicken, and chorizo, lower heat to medium. If using chorizo in casing, after a few minutes, begin to break apart the sausage. Cook meat and vegetables for another 10-12 minutes, or until meat is almost cooked through.
Mix together spices in a small bowl: chili powder, cumin, paprika, oregano, and salt. Add spices to meat and vegetables. Coat the meat and vegetables evenly. Add in the beer or chicken broth.
Add tomatoes, chipotle peppers and adobo sauce, and pumpkin puree. Continue to stir and mix.
Lower heat to a simmer, and let cook for at least 30 minutes, up to an hour, stirring occasionally.
Serve hot, add cilantro and avocado to garnish (optional)