Heat the oil in a large pot or Dutch oven over medium-high heat. Add the onion and jalapeño, cooking until the onions soften, about 3 to 4 minutes. Stir in the garlic and cook for another 30 seconds.
1 tbsp. olive oil, 1 small red onion, 1 medium jalapeno , 3 cloves garlic, minced
Add the chicken, fire-roasted corn, and green chiles to the pot. Season with Tajín, cumin, chili powder, salt, and pepper.
2 (12 oz.) skinless, boneless chicken breasts, 1 (12 oz.) package fire-roasted frozen corn*, 1 (4 oz.) can diced green chiles, 1 tbsp. Tajin seasoning, 2 tsps. ground cumin, 2 tsps. chile powder, 1/2 tsp table salt, 1/4 tsp finely ground black pepper
Pour in the chicken stock and bring it to a boil. Reduce the heat to a simmer, cover, and let the soup cook for 25 minutes.
4 cups (32 oz.) chicken stock
Remove the chicken and shred it into bite-sized pieces, then return it to the pot.
Stir in the sour cream, Monterey Jack cheese, lime juice, and cilantro, and simmer on low for another 3 minutes.
2 cups sour cream (full-fat), 1/2 cup shredded Monterey Jack cheese, juice of one lime, 1/4 cup chopped cilantro
Serve the soup topped with queso fresco crumbles, lime wedges, and chopped cilantro.
1/2 cup crumbled queso fresco, lime wedges and chopped cilantro for garnish