I recently saw a pin on Pinterest for oven bake clay eyeballs.
I decided to try to take it a step further and make oven baked safety back doll eyeballs. I took a cookie sheet I no longer want and drilled holes in it, which are approximately the same size as the posts on the store-bought doll eyeballs I have.
I shaped my clay so that it sticks through those holes.
Here are the instructions for the regular eyeballs: https://www.pinterest.com/pin/286823069990122982/