Steam green beans for 4 minutes, and then rinse with cold water or ice water bath to stop cooking.
Saute mushrooms in butter in medium-hot pan until slightly browned, about 2 to 3 minutes. Using a slotted spoon, remove mushrooms to a small bowl. Use the butter and juice from cooking the mushrooms to make the sauce. Mix salt and pepper with Pamela's Bread Mix or All-Purpose Flour and whisk into juices, stirring constantly so no lumps appear. Add half and half, and stir over medium heat until thickened.
Slice onion into 1/8 to 1/4 inch rings and separate the rings. Mix Pamela's Bread Mix or All-Purpose Flour with salt and pepper. Dip onions in mix and shake loose some of the flour. In a deep pan of oil heated to 300°, fry onions in small batches until slightly browned. Drain.
Preheat oven to 350°. In a buttered 9x9 casserole dish, mix sauce together with mushrooms, green beans and half of the fried onion rings. Bake, covered with foil, for 25 minutes. Remove foil and add last half of the fried onion rings on top. Bake 10 more minutes, or until bubbly, and serve.
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