Saute the chicken (if raw) and onions, garlic
Add any other raw veggies, and lentils (if using). Add enough broth to cover, or supplement with water. Bring to a boil. Cook until veggies begin to soften and lentils are mostly cooked.
Reduce heat to med-low. Add salsa and diced tomatoes. Simmer for a bit. Add any additional seasonings to taste: cumin, salt/pepper, chili powder, garlic powder, etc.
Add white beans and corn. Simmer some more.
Once everything is cooked well and reduced and looks more like chili-consistency and less like soup, turn the heat off. Let cool for a few mins, and add 1 cup of sour cream and stir well until totally combined.
Serve topped with shredded cheese, and with tortilla chips, and any other toppings. Diced avocado is delish. Chopped fresh tomato and/or green onion would be amazing. Load it up.