Egg

Throughout the Marioverse, Eggs have many uses. In the Paper Mario series they restore 5 HP and make a Fried Egg when cooked.

Yoshi Eggs
Main Article: Yoshi Egg

The spotted Yoshi Eggs are white with specifically-colored spots.

Yoshi Eggs are able to be used as projectile weapons--mainly by the Yoshis themselves.

Birdo Eggs
Main Article: Birdo Egg

Although recent discoveries have proven that Birdos can spit pink Yoshi Eggs, most Birdo Eggs are non-spotted. A Birdo will spit Birdo Eggs out of its cannon-like snout, and use the eggs like bullets. The player can jump on these to get a free ride.

Mystic Egg
Main Article: Mystic Egg

Found only in the Boggly Woods, Mystic Eggs are from an unknown creature. Nobody knows where to find them except the Puni girl, Petuni. For a certain favor, Mario can obtain Mystic Eggs from Petuni during the events of Paper Mario: The Thousand Year Door. Like in its prequel, the egg recovers 5 HP and may be used in all sorts of recipes.

Mystic Egg Recipes

 * Egg = Fried Egg
 * Fire Flower + Egg = Egg Bomb
 * Horsetail + Egg = Omelette Meal
 * Mushroom + Egg = Omelette Meal
 * Super Mushroom + Egg = Omelette Meal
 * Ultra Mushroom + Egg = Omelette Meal
 * Life Shroom + Egg = Omelette Meal
 * Dried Bouquet + Egg = Space Food
 * Cake Mix + Egg = Zess Cookie
 * Fresh Pasta + Egg = Zess Dinner

Mario Kart: Double Dash!!!
It is a special attack in Mario Kart: Double Dash!!!. It is exclusive to Yoshi and Birdo. It won't stop rolling until it rolls an entire lap or collides into a driver. Collision causes the player to crash, and spills three random items onto the track. This can include Green Shells, Mushrooms, Bananas, and maybe a Star or Bob-omb. Unlike a Red Shell, it breaks after a certain amount of time if it doesn't get to its target.