The super large egg is special egg that can be found in Fred the Farmer's chicken yard in Lumbridge, or by killing chickens during Cook's Assistant. It is one of the ingredients for the royal cake.
Attempting to take the item before or after the quest will generate the message "You have no reason to pick that egg up; eggs of that size are only useful for royal cakes."
- The Super Large Egg, along with Top-quality Milk and Extra fine flour, were added in December 2009 to prevent players from just gathering the ingredients beforehand, thereby completing the quest in a matter of seconds. This may also be a reference to the fact that many players use quest guides to know what to do beforehand.