In a large pot, add the 1 tablespoon olive oil, diced 1 small yellow onion, and 1 red bell pepper and simmer on medium-low heat until the onions start becoming translucent and the pepper are soft.
Add the 2 garlic cloves (minced) and 1 jalapeno pepper (if using) and cook, stirring frequently for 1 minute.
Increase heat to medium and add 1 lb ground turkey and cook until browned.
Add 1 cup chicken stock, 14 ounces diced tomatoes, 14 ounces tomato sauce, and 2 tablespoons raw apple cider vinegar and stir together.
Add in 14 ounces dark red kidney beans, 1½ tablespoons chili powder, 1 tablespoon paprika, 2 teaspoons ground cayenne pepper, 1 ounce bittersweet baking chocolate, 2 tablespoons light brown sugar, and stir together.
Simmer over medium heat for 40 minutes, stirring occasionally. Chili will be watery at first but will thicken up.
Turn off heat after the 40 minutes has passed and let rest on the stove for another 10 minutes. Add salt and ground black pepper to taste.
Serve with sour cream, cheddar cheese, and green onions and any other desired toppings.