Before we reveal the answer, check out these classic old-school Montana food joints. So Elk Jerky or Def Jerky should be very popular, and they are, but that's not the top snack in Montana. According to Cheapism, the most popular snack in Montana is....Chex Mix. Don't get me wrong, I love me some Chex Mix, but is that really the most popular snack in the state? When it comes to culinary creations, Montana has had its share of additions to the global palate, including the 8 Montana foods below.