Chop the bell peppers, carrots, celery, onion, and garlic.
Place large pot over medium heat and add olive oil, onions, oregano, cumin, and salt. Stir occasionally for 3-4 minutes until onions are translucent.
Add the chopped bell peppers, carrots, celery, and garlic. Stir occasionally for 3-4 minutes.
Add the diced tomatoes (with juice from the can), lentils, black beans, kidney beans, chili garlic sauce pr cayenne pepper, black pepper, and the broth or water.
Bring to a boil, reduce heat down to the lowest setting, cover with lid. Simmer for 40 minutes or until lentils are at the desired softness.
Top with cheese, avocado, corn chips, or anything you'd like!