From the Super Mario Wiki
An Egg Bomb is an item that can be used as an ingredient or be created from a recipe. In Paper Mario: The Thousand-Year Door it can be cooked by Zess T. and it deals six points of damage to one enemy in battle. In Super Paper Mario it is cooked by Dyllis from Flopside, both the ingredients and the effects of the item are different as it deals damage to all enemies on-screen.
Names in other languages
||nitro egg (possible pun on nitroglycerin, an explosive liquid)