(this is not my casserole, but it sure looks tasty!)
I'm a casserole girl. I can make a mean casserole. I love casseroles because every casserole is dump and bake to me. I hardly use recipes because they're so easy, as long as you know the flavor you are going for and you have a 'cream of' soup base, it'll bake up quite nicely. Could not be easier!
In fact, cooking in itself is not something that I view as a science, I view it more as an art. Anybody can follow a recipe, but to be able to throw something together and it taste awesome, well that's talent.
I made a green bean casserole this morning to take to my husband's grandmother's house for our Christmas lunch today and it was gobbled up and several people asked me for the recipe and suggested I make two next year! I made that for Thanksgiving and took it to my grandmother's house.... hey, if it ain't broke don't fix it. :D
Here's the recipe, it's probably not unlike your recipe, but I don't have any exact measurements so I'm kinda guessing how much I use.
4 cans of cut green beans
2 cans of cream of mushroom soup
half a can of milk (you can use water in a pinch, it wont make it bland)
1/2 to 1tsp of salt ( I usually just pour some in the palm of my hand)
probably a tablespoon of onion powder ( I start sprinkling and use the "say when" method)
French fried onions
Add all the ingredients together. Add about a half a cup of the french fried onions into the casserole mix and make sure it's all mixed well. Top with french fried onions. Bake at 350 until it's bubbly. That usually takes about a half an hour in my oven.