Start by heating the olive oil in a skillet over medium heat. Add the chopped onion and sauté until it's soft and translucent, about 5 minutes. Stir in the minced garlic and cook for another minute until fragrant.
Transfer the sautéed onion and garlic to your crockpot. Add the chicken broth, tomato sauce, fire roasted diced tomatoes, green chiles, chopped cilantro, shredded chicken, taco seasoning, and corn. Stir everything together until well combined.
Cover the crockpot and set it to cook on low for 6-8 hours or on high for 3-4 hours. This allows all the flavors to meld beautifully.
About 30 minutes before serving, cut the burrito tortillas into strips. Toss them with a tablespoon of taco seasoning and a drizzle of olive oil. Spread them on a baking sheet and bake at 400°F (200°C) for about 10-12 minutes until they’re crispy.
Once the soup is ready, give it a good stir and taste for seasoning. Serve the soup hot in bowls, garnishing with your choice of sliced cilantro, jalapeños, low-fat sour cream, and low-fat shredded cheese. Don’t forget to add those crispy tortilla strips for an extra crunch!