I'm not entirely sure if this was animated at Hanna-Barbera or not. One thing is for certain. A different actor other than Stan Jones was hired to be the voice of Lex Luthor for this ad shilling the short-lived Superman peanut butter, put out by Sunnyland in 1983. Not sure if Danny Dark, who was the voice of the Man of Steel in those days, did this ad, either. Uploaded by panbiscuit to YouTube:
I never tried the stuff, and I hardly even saw it in stores in my area, to begin with!