If it works for you, you can eat just one square(my problem) and it not cause you problems. Shouldn't be too much of a problem, just remember that it might kick you out of ketosis for a bit and make sure to keep track of the carb count.

If this is the thing that will let you stay eating this way, and cause no ill effects. I'd say, go for it. Just don't make it an everyday occurance.

Everyone is different though, and I couldn't do it!