What fictional spokesperson was featured in the first CBS color television commercial in 1951?

Betty Crocker programs first appeared on radio on local stations in 1924. The first network Betty Crocker broadcast was on NBC in 1926. The show remained on network radio until 1953; most of the time the program was on NBC or CBS.

Back in 1949, actress Adelaide Hawley Cumming became the spokesperson for Betty Crocker. She appeared for several years on The George Burns and Gracie Allen Show, and even had her own TV show. She (Cumming) appeared in the CBS network's first color commercial in 1951, in which she baked a "mystery fruit cake".

Hawley in her TV career continued to portray Betty Crocker until 1964.