Heat 1 tablespoon of olive oil in a large pot over medium heat. Add the diced onion and cook until translucent and soft, about 5 minutes. Stir in the minced garlic, diced bell pepper, and jalapeño. Cook for another 3-4 minutes until the peppers soften and the kitchen smells fragrant.
Add the ground cumin, smoked paprika, and chili powder to the pot. Stir well to coat the veggies in the spices and toast them slightly, which will release their aromatic oils and deepen the flavor. Season with a pinch of salt and pepper.
Pour in the drained and rinsed black beans, diced tomatoes with their juices, and 4 cups of vegetable broth. Stir everything together and bring the soup to a gentle boil.
Reduce the heat to low and let the soup simmer uncovered for about 20 minutes. This allows the flavors to meld and the soup to thicken slightly. Taste and adjust seasoning with more salt or pepper if needed.
While the soup simmers, preheat your oven to 375°F (190°C). Spread the corn tortilla strips on a baking sheet in a single layer. Bake for 8-10 minutes or until crisp and golden, flipping halfway through for even toasting.
Ladle the hot Smoky Black Bean Tortilla Soup into bowls. Top each serving generously with diced avocado, fresh cilantro, and a handful of crispy tortilla strips. Serve with lime wedges on the side for squeezing over the soup just before eating.