1. Whisk together the cream of mushroom soup and milk until well combined.
2. Add the green beans and stir to coat.
3. Grease the bowl of a slow cooker with nonstick cooking spray. Pour the green bean mixture into the slow cooker.
4. Stir in half of the Fried Onions.
5. Set the slow cooker to cook on low for four hours or high for two hours.
6. Pour on the remaining Green Onions just prior to serving.