Using a large skillet, lightly sauté the onions in the oil. Add in the mushrooms, and bell peppers cooking only until the onions are translucent. Remove from heat immediately.
Transfer the onion mixture to your slow cooker crock.
Using the same pan, cook the turkey just enough to brown it, breaking it up as you cook into tiny pieces. Once browned, add the meat to your crock as well.
Add the zucchini, spices and broth to the crock last, and cook on low for 2-4 hours.
Add salt and pepper to taste.
Notes
Please note that the nutrition data is a ballpark figure. Exact data is not possible.