Start by heating your pot over medium-high heat with the olive oil. Add the chopped yellow onion and diced jalapeño and sauté until the onion starts to soften. Then stir in the minced garlic, dried oregano, and chili powder so the aromatics bloom and release flavour.
Pour in the chicken bone broth then add the chicken breasts, kosher salt, and black pepper. Bring everything up to a boil, then reduce the heat to a simmer. Cover and cook for 10-15 minutes until the chicken is fully cooked through.
While the chicken cooks, mix the cornstarch and water in a small bowl until smooth. This slurry will help thicken the chili so you get that hearty, comforting texture rather than something overly watery.
Remove the cooked chicken to a plate and shred it with the forks. Return the shredded chicken back to the pot along with sour cream, shredded cheese, frozen sweet white corn, chopped cilantro, and fresh lime juice. Stir well, then pour in the cornstarch slurry and leave to simmer uncovered for another 10 minutes, stirring occasionally so it thickens nicely and the flavours meld.
Divide the chili into bowls and pile on your favourite toppings like cotija cheese, bacon crumbles, tortilla strips, or sliced avocado. The optional garnishes make it extra fun and flavourful.