Help-Baking In Terra Cotta Pots????
Decorating By dweddings Updated 22 Apr 2010 , 12:58pm by jayne1873
Try googling it, I did, and here's what I found.
http://www.ehow.com/how_5811536_bake-terra-cotta-flower-pots.html
I've done it a few times.
Obviously I used a brand new pot - and thoroughly washed it.
There was a hole in the bottom of the pot, so I firstly put a disc of foil at the bottom. I then completely lined the pot with baking parchment and another disc of baking parchment at the bottom of the pot.
It came out absolutely fine! 
I used terra cotta pots a few years ago for baked Christmas puddings. Worked like a charm. I used shortening to grease them well, after a couple of uses the terra cotta had absorbed enough shortening I didn't need to use it anymore (I made 80 for a Christmas sale). I used the 6" ones and dropped a basket type coffee filter in the bottom, it stopped the pudding(cake-like) from sticking to the bottom and sealed off the hole but I had to take the pudding out of the pot while it was still hot and remove the filter or it stuck a bit when it was cold.
Terra cotta is fired at approx. 2167⁰F - 1165⁰C so impurities in the clay is burned off during the long firing time and high heat. If you're still paranoid about this look for the pots with the glazed insides.
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