Step 1: Make the Tortilla Strips: Preheat oven to 375°F (190°C). Toss tortilla strips with olive oil and salt. Spread in a single layer on a baking sheet. Bake for 12–15 minutes, flipping halfway, until golden and crispy. Set aside.
Step 2: Cook the Base: Heat olive oil in a large soup pot or Dutch oven over medium heat. Add onion and cook until softened, about 5 minutes. Stir in garlic and jalapeño, cooking for another minute. Add cumin, chili powder, smoked paprika, and cayenne; cook for 30 seconds to release aroma.
Step 3: Build the Soup: Add fire-roasted tomatoes, chicken broth, beans, and corn. Stir in shredded chicken. Season with salt and pepper. Bring to a boil, then reduce heat and simmer for 20–25 minutes to let flavors meld.
Step 4: Finish and Serve: Stir in lime juice just before serving. Ladle soup into bowls. Top with crispy tortilla strips and desired garnishes (avocado, cheese, cilantro, sour cream).