In 1948, Betty Crocker published 14 recipes for chiffon cake; the formula had been the secret of a California insurance salesman for 20 years before he sold it to Gener…

For 20 years, a California salesman kept his chiffon cake recipe secret until Betty Crocker revealed 14 variations in 1948, ...
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The Best Coffee Cake I’ve Ever Made Comes From a 1950s Betty Crocker Cookbook

It’s a classic for a reason.