Heat the olive oil in a large soup pot over medium-high heat. Add in the onion, carrots, celery, bell peppers, mushrooms, and jalapeno pepper and cook, stirring occasionally, until the vegetables are soft and fragrant, approximately 5-7 minutes.
Add in the ground beef and garlic and generously season with salt and black pepper, to taste. Cook, breaking up the meat with a wooden spoon, until the beef is browned, around 5-6 minutes.
Add the oregano, cumin, chili powder, cayenne pepper, and tomato paste. Stir everything together and cook for another minute or two, or until the spices become fragrant.
Add the crushed tomatoes and the broth and bring to a boil. Once boiling, reduce heat to medium and simmer for 15-20 minutes, stirring occasionally.
Remove from heat and adjust seasonings, if necessary. Top with pickled jalapeno pepper and red onion or diced avocado and cilantro, if desired, and serve immediately. Enjoy!