Warm the oil in a large stockpot or Dutch oven over medium-high heat. Add onion and cook for 2-3 minutes, until it begins to soften.
2 teaspoons extra-virgin olive or avocado oil, 1/2 medium onion
Stir in the tomato paste, adobo sauce if using, chili powder, oregano, garlic powder, cumin, and salt. Cook for about 1 minute, stirring well.
2 Tablespoons tomato paste, 1 Tablespoon adobo sauce, 1 Tablespoon chili powder, 2 teaspoons dried oregano, 1 teaspoon garlic powder, 1 teaspoon ground cumin, 1/2 teaspoon kosher salt
Stir in the diced tomatoes, with all of their juices, and cook for 2-3 minutes, stirring occasionally. The liquid should reduce and thicken a bit.
1 (28 ounce) can diced tomatoes
Stir in the chicken broth and bring the mixture to a boil. Add the chicken, beans, and corn, then reduce heat to low. Simmer for 10-12 minutes.
4 cups low-sodium chicken or vegetable broth, 2 cups shredded or diced cooked chicken, 1 (15 ounce) can black beans, 1 cup corn kernels
Just before serving, stir in 1-2 teaspoons lime juice. Sample and season with more lime juice and salt to taste. Serve topped with tortilla strips, diced avocado, sour cream, Cotija, fresh cilantro, etc. Enjoy!
lime juice or wedges, tortilla strips, avocado, sour cream, Cotija cheese, cilantro, etc.