Preheat large dutch oven or heavy bottom pot on medium - high heat, swirl a bit of oil to coat, and add ground turkey. Cook for 5 - 7 minutes, stirring occasionally and breaking into pieces.
Add taco seasoning and cook for 1 more minute, stirring frequently.
Add tomato sauce, beans, corn, onion powder, maple syrup, salt, pepper, water; and stir.
Cover, bring to a boil, reduce heat to low and simmer for 20-60 minutes. Longer cook time means deeper flavors but overall soup is ready fast.
Slow Cooker Method:
Preheat large non-stick skillet on medium - high heat, swirl a bit of oil to coat, and add turkey. Cook for 5 - 7 minutes, stirring occasionally and breaking into pieces. Add taco seasoning and cook for 1 more minute, stirring frequently.
Transfer to a large slow cooker along with tomato sauce, beans, corn, onion powder, maple syrup, salt, pepper, water or broth and stir. Cover and cook on Low for 7 - 8 hours or on High for 3 - 4 hours.
Serving: Serve taco soup hot with cilantro, sour cream or yogurt, lime, avocado, green onion and tortilla chips.
Notes
Store: Refrigerate in an airtight container for up to 5 days.
Freeze: Cook, cool and freeze in an airtight container, leaving some room for expansion, for up to 3 months. Thaw in the fridge overnight, then reheat on a stovetop on low heat while covered.
You might need to use less salt if using regular (not low sodium) tomato sauce.