Yoshi Cookie

Yoshi Cookies are a certain kind of cookies that are the favorite snack of the Yoshis. Most of these cookies seems to consist of dark chocolate, white cholocate, and some have what might be either jelly, gelatin, or jam. They come in many varietes, some of which are shaped like flowers, hearts, circles, or Yoshi's face.

Yoshi's Cookie
In their debut game, the Cookies would came from either the top or the side. The plot of the game is to clear them out, which could be done by pressing the A button and switching the entire row's all cookies. Once a row was, either horizontally or verically, filled with the same kind of cookies, it was clear. The cookie shaped like a Yoshi-head acted like any kind of cookie.

Super Mario RPG: Legend of Seven Stars
Mario and Yoshi were required to bring Yoshi Cookies to Boshi in exchange for a race. Yoshi Cookies also could be used in battle where they would summon Yoshi and he would eat an enemy to defeat it completely. Sometimes, it awarded Mario an item as well. However, Yoshi can't eat some enemies and bosses; if so, Yoshi would give Mario a Yoshi Candy or return another Yoshi Cookie back.

Paper Mario series
If Mario gave Tayce T. a Melon and a Cake Mix, she will make a single Yoshi Cookie. This item restores fifteen HP and fifteen FP. The Yellow Yoshi in Yoshi's Village has a Melon if Mario brings him any type of food made with Cake Mix.

Also, all Paper Mario-games has items consisting of varities of Yoshi Cookies; in Paper Mario it's Big Cookie,  in Paper Mario: The Thousand-Year Doorit's Zess Cookie, and in Super Paper Mario'' it's Sweet Cookie Snack.

Game & Watch Gallery 4
In the Game & Watch Gallery 4, the modern version of Mario's Cement Factory replaces cement making with cookie making. The cookies are from Yoshi's Cookie. If Yoshi gets the Yoshi Cookies from the top sent by Mario, he would instead eat the Yoshi Cookies instead of packaging them. If the Yoshi Cookies are sent to Toad at the right side, he would package them. Interestedly, the Yoshi Cookies fit in the packages whole.

Mario & Luigi: Partners in Time
In Mario & Luigi: Partners in Time in the place Yoshi's Island in the past, Kamek is getting cookies for Baby Bowser. When Kamek gives them to him, Baby Bowser eats too fast and then he feels sick. Luigi takes four Yoshi Cookies that Kamek dropped. He gives one to Baby Luigi immediately. Later, he gives two cookies to Baby Mario and Baby Luigi to calm them down after a crash landing in Yoob's Belly. The remaining cookie Luigi gives Baby Luigi at the very end of the game, in exchange for Baby Luigi's Hammer.

Mario Kart: Double Dash
The battle course Cookie Land is shaped like a cookie and has a veriety of Yoshi Cookies in the background. This stage later reappeard in Mario Kart Wii.

Tetris DS
In Tetris DS, Yoshi Cookies appear in the Puzzle Mode, which is based of the NES version of Yoshi's Cookie. They appear in the glass tube that forms the bottom and right edges, where they are constantly moving. They also appears on the Touch Screen of the same mode, forming a certain pattern in the background, and also in the foreground, where Yoshi is seen eating a heap of Yoshi cookies in the middle.