1 16 oz bag frozen, French cut green beans, defrosted
1 large onion, thinly sliced
8 ounces mushrooms, chopped
1/3 cup fat free plain Greek yogurt
1/3 cup whole wheat flour
1 cup reduced fat butter milk
2 tsp reduced sodium soy sauce
1/2 tsp freshly ground pepper
1 cup Fiber One cereal
1/4 cup liquid egg whites
1 tsp garlic powder
1 tsp salt