Electrocookies appear to be a variety of perf board not a breadboard. Creating one is even more difficult than a breadboard as it requires a code change in Fritzing (new breadboards can be created, if you know enough, without code changes!) It should be possible (but not particularly easy) to modify a breadboard to look like a Electrocookie, but you would need a different part for each size you want if you don’t want to make a code change. Making breadboards has not been documented because there isn’t a lot of demand to do it (and when someone wants one I usually do it, as that is easiest!) I’ve needed to do it several times and therefore learned how to do it. To be successful you need to be familiar with the xml that creates parts and know the various special settings (which are undocumented so far) that are required to create breadboards. If you have one of the Electrocookies (there appear to be various sizes) that you want I’ll have a look at what it would take.
Peter