Fire cookies

It began slowly, a little tingling in the mouth as he chewed.
It seeped into his throat when he swallowed, and the tingling grew to a mild ache.
Then with only a short breath, that mild ache exploded into a fierce burn.
The cookie fell from the little boy's hand as he darted away from the plate by the fireplace and into the kitchen, in search for something to cool the flames that filled his mouth.
Scales scraped against stone as a young dragon shifted to gaze after his friend. Then returning his attention to the treats, the dragon plucked another cookie from the plate and plopping it into his mouth with a hiss of delight.
Unfortunately for the dragon, that was last time the boy invited him to bring the snacks for their weekly playdate, as apparently winter fire cookies were not good for humans.