Energon goodie

An energon goodie is a food item from the Generation 1 continuity family.

Don't get too addicted to them; the withdrawal is terrible.

Energon goodies are a Cybertronian food item made of energon, often fed to hostile creatures in hopes of calming them. They are kept in small containers which can be used to dispense the goodies one at a time.

It is presumably the main ingredient of energon goodie cake.

Fiction

The Transformers cartoon

When Kup and Hot Rod encountered the hostile Allicons on Quintessa, the two tried to calm the creatures down by feeding them energon goodies and using the universal greeting. The goodies worked quite well... until the pair ran out of goodies to feed the hostile creatures, who proceeded to capture them and take them to the Quintesson judges. Upon their arrival on Junkion, Hot Rod offered one to the Junkion leader, Wreck-Gar. The Transformers: The Movie

Transformers Animated: The Cool Extra

While encountering a Rock Lord, Rodimus lamented that he didn't have any "energon gum" on him. If he had, he was sure he'd be able to befriend the monster.

So instead, he just killed it. The Cool Extra issue 2