Add the olive oil to a large skillet and heat over medium-high. Swirl the oil around the bottom of the skillet, then sauté the onion and bell pepper for 2-3 minutes. Season with salt and pepper and add in the garlic and sauté another 30 seconds. Add in the ground turkey and turkey sausage and season with a little more salt and pepper. Crumble the turkey and cook until it's browned and mostly cooked through. Pour the mixture into the slow cooker.

Add the remaining ingredients to the slow cooker and stir everything together. Cover with the lid and cook for 3-4 hours on high or 6-7 hours on low. When the chili is done, remove the parmesan cheese rind and discard (if you chose to include). Serve the chili topped with shredded mozzarella cheese, ricotta cheese and chopped flat leaf parsley or basil.