Turns out I have it on a card, though I'm pretty sure it was in a book,
too.

Souperburger
Source: Tested Recipe / Home Economics Department / Campbell Soup Company

1 pound ground beef
1/2 cup chopped onion
1 tablespoon shortening
1 can Campbell's Chicken Gumbo, Golden Mushroom, Tomato, Vegetable, or
Cream of Mushroom Soup
1 tablespoon prepared mustard
Dash pepper
6 buns, split and toasted

In skillet, brown beef and cook onion in shortening until tender; stir
to separate meat. Pour off fat. Add soup and seasonings. Cook 5
minutes' stir now and then. Serve on buns. Makes 6 sandwiches.

--
-Barb, Mother Superior, HOSSSPoJ
http://web.me.com/barbschaller
Glorified Rice 2-24-2009