Heat olive oil in a large pot over medium-high heat. Add the chopped onion, minced garlic, and red bell pepper. Sauté for 5–7 minutes, stirring frequently, until softened.
Add the ground turkey to the pot and break it apart with a spoon. Cook until the turkey is browned and no longer pink.
Stir in the chili powder, cumin, oregano, cayenne pepper, and salt. Cook for about 20 seconds to toast the spices.
Add the diced or crushed tomatoes, chicken broth, kidney beans, and corn. Stir everything together and bring the mixture to a boil.
Reduce the heat to low and let it simmer for 30–45 minutes, stirring occasionally, until the chili thickens and the flavors meld. Taste and adjust the seasonings as needed.
Serve hot with your favorite toppings, such as shredded cheese, diced avocado, tortilla chips, cilantro, or sour cream.