Butternut Bread is a brand of American white sliced bread. It has used Snoopy, Woodstock and other Peanuts characters in its advertising.
Snoopy Butternut Bread Commercial
Butternut - "Peanuts Stickers Promotion" (Commercial, 1978)
Butternut Bread - "Snoopy For President Sweepstakes" (Commercial, 1980)
An almost identical commercial was also made for the brand Weber's Bread. Both commercials also refer to Dolly Madison cakes.