I finally did it! I gave my DS one piece of VERY overcooked Red Baron pizza! He loved it and so far has had no symptoms. He started with 1 small bite, then increased it every 10-15 minutes. After about 1 hour, he finished the whole piece. Before cooking it, I scraped off a layer of cheese so there was only 1 layer shredded on the top.
After he took the last bite, he asked for something to drink because of the taste. But, that's what he does when he eats goldfish, so I'm trying to ignore it.
I read this thread right before giving it to him to get my courage up... Thanks so much for all your support and encouragement!!