Hamburger Stroganoff

1 lb ground beef
1 small to medium onion, chopped
1 can cream of mushroom soup
1/2 cup milk
2 cups cooked noodles
2 T butter
1 t salt
1/4 t pepper
1/2 cup sour cream

Sautee onion in a small amount of olive. Add burger and brown. Drain meat, add soup, milk, noodles, butter, salt, and pepper. Simmer 10-15 minutes, covered. Uncover and simmer another 10 minutes. Remove from heat and add sour cream. Heat through, but do not boil. Serve