Hi, if the main thing is to keep it simple. If it is the same as what I had to do for my PTTLS, it could be on absolutely anything. I opted to do mine on massage because that is what I am passionate about. My advice would be choose something you could talk about for hours and enjoy, then pick a very small part of it, prepare some hand outs, visual aids etc. and think class participation the more fun the better, finish off with a quick quiz to assess. I sat through about 11 other micro teach sessions on my course and all had something in them that i thought was great, with the exception of 1,who just read parrot fashion from the hand out sheet she had prepared and had very little interaction. remember 30 minutes sound like a long time but believe me it fly's by. When i did mine I was a complete wreck, i couldn't eat all day through nerves, and i was so relieved when it was all over. We had our recorded as well, and i have to say that although i hated being filmed, watching it back did wonders for my confidence. I hope this helps a little at least. Good luck.xx