Heat the oil in a large pot over medium-high heat. Add the garlic and onion. Cook, stirring frequently, for 1 to 2 minutes, or until softened.
Add the ground turkey. Brown the turkey in the pot, being careful not to separate the turkey into small bits. Add cumin, cinnamon, red pepper, and chili powder.
Add the tomatoes and bring the chili to a simmer. Add the corn, beans, bell pepper, and jalapeno pepper, if desired. Season with the salt and black pepper.
Return the chili to a simmer. Remove from the heat. Garnish with the cilantro.