For this, you'll need colored and clear glass shards, a glass-blowing furnace and tube, cancerous cells in a syringe, a nearby hospital, scissors, cure for cancer.
First, heat up your tube in the furnace. Then, dip in glass shards. Place tube in furnace, while blowing lightly on the other end. Take out of oven, repeat until you get desired marble amount. Then, inject the chicken with the cancerous cells. Take it to the local hospital. When it's lying in bed, use the scissors to cut open the drip bag, and insert marbles. Marbles will enter the blood stream, and eventually go to the stomach lining. The lining will break, and the marbles will be in the chicken's stomach. Cure cancer.
Behold, your chicken has eaten marbles.