Preheat your Ninja cooking system. I set mine to oven bake at 275 degrees. Adjust this temperature based on the amount of time you want to cook.
Place your chicken breasts into the pan spread evenly apart.
Pour the entire can of cream of mushroom soup on top of the chicken. Allow to cook for several hours (with the Ninja cooking system it cooks much faster at a lower heat then with a slow cooker).
During the last 30 minutes of cooking, sprinkle the tops of the chicken with the cheddar french fried onions and allow to cook until finished.
Serve with a side of vegetables or rice and enjoy!