Cold oatmeal sucks
It sucks, but I just looked at going to the microwave to re-heat as another reason to get off my large rear, heh. That is why I didn't elect to get a plate warmer, but I guess those are out there. I've seen people posting. Try covering your oatmeal with a dish towel in between bites if you don't do that. That helped me a little. Hang in there!
Try one of those candle warmers or coffee cup warmers. They plug in and are just the right size for a bowl. I have one on my desk at work for my coffee and I use it when I eat my lunch at my desk. I got mine at WalMart
http://www.amazon.com/Cup-Mug-Coffee-Candle-Warmer/dp/B002P9 XTNO/ref=sr_1_8?ie=UTF8&qid=1305043953&sr=8-8
http://www.amazon.com/Cup-Mug-Coffee-Candle-Warmer/dp/B002P9 XTNO/ref=sr_1_8?ie=UTF8&qid=1305043953&sr=8-8
...though she be but little, she is FIERCE...
A Midsummer Night's Dream
Yes! Coffee mug warmers work great for this! I bought 2 online--one for work and one for home. They don't bring anything cold up to warm temp, but if you put something on it hot, it will stay warm. The bottom especially gets warm, so just stir up your oatmeal & take a warm bite from the bottom. I think they cost about $7.