Drain the green beans and add to the sauce. Add the remaining thawed frozen green beans. Transfer the creamy beans to a casserole dish. Top with crispy onions. Bake until golden brown on top.
Preheat oven to 195°C /175°C. Combine all ingredients, reserving the fried onions and transfer to a casserole dish. Bake for 25-30 mins adding the remaining fried onions for the final 5 minutes.