Research plant cell parts and present findings as a four-column list. Next to the name of each cell part should be its function, a simple drawing of it and an idea of what edible item could represent it. An example would be: Mitochondria -- cell powerhouse, picture, jellybean.
Decide what base to use, such as an oversized cookie. The base needs to be large and able to hold various edible items in place. Determine any project limits and, depending on available resources, if each child will make his own or if this will be a whole group project. Ideas for cell parts include a gumdrop nucleus, jellybean mitochondria, thin licorice endoplasmic reticulum, sprinkles as ribosomes and Smarties vacuoles.
Present finished products to the class, or have each child present his part of the project. This incorporates public speaking skills while allowing students to teach the information to others, which is a proven tool for making learning stick. Be sure to document the project in photos or record the presentation in case of questions once the project has been consumed.
Consider playing a game-show style game while the children are eating their cell parts. The fun atmosphere promotes increased learning and the presentations will serve as preparation for the game.