Willie Williams https://www.youtube.com/watch?v=G1KV51qIdI0
Howlin Wolf https://www.youtube.com/watch?v=9Ri7TcukAJ8
or Screamin Jay Hawkins https://www.youtube.com/watch?v=7kGPhpvqtOc
It surprises me a little because the Dorito commercial sounds like a fairly generic blues backing track and a raspy voiced singer. From the article, there's an indication that Doritos was looking to replicate the sound and feel of the song, and they were aware of the legal concern. But to me it kind of sounds like Tom Waits is doing an impersonation, the Doritos song is doing an impersonation, but it's not totally obvious from the song that the Doritos impersonation necessarily goes via Tom Waits rather than back to the original source material.