Pour the cans of green beans into the soup mixture and stir gently to coat.
Spray the inside of the slow cooker with cooking spray or use a slow cooker liner.
Add the green bean mixture to the crock.
Cook on HIGH for 2-3 hours.
Top casserole with French fried onions 5-10 minutes before cooking is finished.
Turn slow cooker to warm until you're ready to serve.
Notes
You can use cut green beans or french style green beans.Please note: All nutritional values are estimates. Actual values depend on the specific products used.