Everyone has their own version of green bean casserole. I've tried dozens and my family's recipe is still my favorite.
Preheat the oven to 350 degrees.
Mix all the ingredients together, except milk and half the fried onions.
Once mixed add milk small amounts at a time until you reach your desired consistency.
Cover and cook for 30 minutes at 350 degrees.
With 5 minutes remaining, uncover and top with the remaining fried onions. Cook uncovered for an additional 5 minutes.