Heat olive oil in a large pot over medium heat.
Add chopped onion and sauté until translucent.
Stir in minced garlic and diced bell pepper, cooking for an additional 2-3 minutes.
Add the canned tomatoes and their juices, stirring to combine.
Pour in the vegetable broth and bring to a simmer.
Add black beans, corn, cumin, salt, and pepper.
Let the soup simmer for 20 minutes to allow flavors to meld.
Taste and adjust seasoning as necessary.
Serve hot, garnished with crispy tortilla strips.
Add a dollop of sour cream and sprinkle cheese on top.