In a large Dutch oven, cook the bacon over medium heat until it begins to brown and starts to render its fat. Add the olive oil, the chopped onion, kosher salt, and black pepper. Cook for 3 to 5 minutes until the onions begin to soften and become somewhat translucent. Mix in the chopped garlic and cook for an additional 5 minutes.
Add the ground sirloin along with the ground buffalo and continue to cook over medium heat. Stir occasionally until most of the pink has disappeared. Skim off any renderings that have collected.
Add the chili powder*, cumin, coriander, oregano, paprika, Creole seasoning, brown sugar, and cinnamon along with the tomato sauce, tomato paste, and crushed tomatoes. Stir in the beef stock and beef base. (*If you like a much milder chili, start by adding 1 teaspoon at a time then adjust to suite your taste.)
Bring the chili to a low boil, reduce the heat to low and simmer partially covered for 1-½ hours, stirring occasionally.
Add the bittersweet chocolate and the cornmeal, stirring to mix into the chili. Add additional kosher salt and pepper if needed. Cook partially covered for an additional 30 minutes, stirring frequently.
Serve with grated cheese, steamed rice*, and/or corn chips.