Incredible Edibles were sold by Mattel in the 1960s. Incredible Edibles involved making a lot of mess in the kitchen all in the aid of creating gloopy sweets. In each pack you would get metal molds into which you squeezed Gooble De-Goop, a type of candy gel that could be baked in the oven (that was actually a strange head with a plug attached to it). The Gooble De-Goop would remain soft but you could mould it into all sorts of shapes like worms and insects. When you ran out of Gooble De-Goop you could still play with your Incredible Edibles as you could purchase separate Goop on blister cards.
Gooble De-Goop was followed up by another set called Kooky Kakes.