Definition of "Twix"

Then—oh so casually—she was asked to select either a Twix bar or an apple, as thanks for her participation in the experiment.

2008, Cordelia Fine, A Mind of Its Own: How Your Brain Distorts and Deceives, page 173

I even ate a Twix before bed each night, not once thinking about how many miles it would take me to run off the calories.

2015, Branch Kimball, My Eating Disorder: Thoughts During Sickness and Recovery