Goop Monster

This is a character concept for another book that only exists in my head at the moment.

When I was a kid I would sometimes experiment with things in the kitchen, playing mad scientist with whatever ingredients I could find. My kids do the same thing occasionally. The story, as it exists in my head, is about a kid whose experiment in the kitchen goes awry, resulting in a goop monster that begins eating everything in sight - growing larger all the while.