1 1/2 lbs. ground beef
4 onions, sliced
1 lb. mushrooms, sliced
2 cans cream of mushroom soup, diluted with 1 can milk
1 container (16 oz.) sour cream or sour half and half
1 pkg. noodles (cooked)

Brown hamburger, onions and mushrooms. Mix with soup, milk, sour cream. Fold into noodles. Bake in 9x13 pan at 350 degrees for 30 minutes.