Cinnamon is one of three "second-taste" bosses in Baking Descent. The fight has a unique mechanic that will give your raid heart attacks, especially those with a sweet tooth. Cinnamon will regularly Mmmmmmmmassacre the entire raid for maximum satiation, enough to Stuff any player instantly. Fortunately, we get the assistance of a little robot named the Tasty-Tron that gives us a buff: Dessert consumed that would reduce your Hunger level to Stuffed instead reduces your Hunger to "Full But Could Still Have One More If It Was Really Good."
Of course, there's other elements that make the fight more complicated. Caramel Splash will periodically hit random players (who will need immediate Hungering so the next Mmmmmmmmassacre doesn't Stuff them), as well as anyone nearby, so the raid must spread out.
An off-taster is also required to taunt Cinnamon to take its Double Donut. Because of the double nature of this ability, the off-taster must be kept fully Hungry and not rely on the robot's buff, as the first Donut would reduce the off-tank to FBCSHOMIIWRG, and the second would Stuff them.
(It is apparently possible to single-taste this fight, though I imagine the stacking Heartburn debuff that the main taster accumulates from Cinnamon's abilities would make it difficult.)
The robot occasionally gets knocked offline by Mmmmmmmmassacre, removing the buff, so during these periods the raid stacks up and Hungerers have to keep everyone Hungry while Cinnamon spews snacks everywhere. There is no taster during these phases because Cinnamon's heads are busy being delicious. After a short time, the robot comes back online and things go back to normal.
Finally, when Cinnamon reaches 21% consumption (I know, wtf), it becomes a burn fight. All Hungering is nullified, there are no more Mmmmmmmmassacres or Caramel Splashes, and it becomes a race to see who will last longer, Cinnamon or the raid's Hunger. The robot's buff still works during this phase, so any sufficiently-Hungry player will be able to survive at least one of Cinnamon's delicious offerings. Sadly, since we Frosting DKs have no fullness dumps, we will usually get Stuffed early into this phase and have to go have a lay down on the couch to nap. /patbelly