Last time I followed a recipe for baked oatmeal you could taste the baking powder! Does it really need it? Can I do without it?
Can you give us a link to the recipe? I'm honestly not familiar with baked oatmeal, but still can't imagine why it would call for baking powder.
A lot of the recipes for some reason call for it. It's great to make for my prayer group tho, http://valsocal.blogspot.com/2013/02/baked-oatmeal-with-bananas-and-chocolate.html?m=1
this link is broken I am sorry to report. I, too, am unfamiliar with baked oatmeal. But you could try making your own baking powder: http://eggbeater.typepad.com/shuna/2006/12/baking_powder_h.html Not all baking powders are created equal, and *many* of them have an awful taste indeed!
Burnin's link worked perfectly for me. Try it again!
I had to cut and paste to get the link to work, and even then had to search the site for "oatmeal" but I found it. A totally new thing for me too -- it appears to be a massive flour-less oatmeal cookie! Of course it would be tasty!
Oh, and to answer your question -- doesn't look like there is any leavening going on, so I'd try it without the baking powder. I'll bet you'll have a fine result.
Better link for those who couldn't access the one posted: http://valsocal.blogspot.com/2013/02/baked-oatmeal-with-bananas-and-chocolate.html