Prepare the Turkey: Heat olive oil in a skillet over medium heat. Add the ground turkey and cook, breaking it up into small pieces. Cook until browned and fully cooked through (about 5-7 minutes). Transfer the turkey into the Crockpot. Chop the Vegetables: While the turkey is cooking, chop the bell peppers, onion, and zucchini (if using). Mince the garlic.
Add Ingredients to the Crockpot: Add the chopped vegetables, garlic, diced tomatoes (with juices), and bone broth into the Crockpot with the browned turkey. Stir to combine.
Season the Chili: Sprinkle in the chili powder, cumin, oregano, salt, and pepper. Stir well to ensure the spices are evenly distributed.
Slow Cook: Set the Crockpot to low and cook for 6-8 hours or on high for 3-4 hours. Stir occasionally, if possible.
Serve: Once the chili is done cooking, taste and adjust seasoning if needed. Serve hot with optional toppings like sour cream, shredded cheese, or avocado.