Heat the oil in a large pot or Dutch oven over medium heat for 2–3 minutes. Add the onion and cook until softened, 2–3 minutes. Add the ground turkey and cook over medium-high heat for 6–8 minutes, breaking into crumbles.
When the meat is no longer pink, add the remaining ingredients. Bring to a boil over medium-high heat then reduce to low and simmer 15–20 minutes, stirring occasionally.
Meanwhile, prepare the sour cream chili topping. Stir together the sour cream and Chili Mix in a small bowl. To serve, top the chili with the sour cream mixture and other toppings, if you’d like.