I realize that some people who are gluten intolerant can't use oatmeal, but if they can, the texture is almost exactly like regular brownies and the flavor is awesome. (bakingbites.com)
You can make regular brownies in an 8 inch square pan. (baconandsouffle.com)
To be honest, I haven't tried freezing them myself, but I assume they should freeze well just as regular brownies. (innerharmonynutrition.com)