From Miss Betty's 1950s Hand-written Recipe Book:
1 cup uncooked white rice
1 can beef bouillon soup
1 can onion soup
2 or 3 pats butter
1/4 cup chopped onions
1/4 cup chopped mushrooms
2 T Worcestershire Sauce
Combine uncooked rice, beef and onion soups in saucepan. Bring to a boil over medium high heat. Cover, turn down to low heat and simmer for 20 minutes. Remove from heat. Brown onions and mushrooms in pan with butter and Worcestershire sauce. Add them to the cooked rice mixture. Pour rice mixture into a greased casserole dish. Cover and bake at 350 degrees for 1 hour.
"Miss Betty" was my mother. I found this old date book in which she wrote her recipes, in her own hand, after her death in 2010.
I particularly remember this recipe. Not sure when she added it in, I'm thinking the early 60s.