Rather than heat in the microwave, I find using a heat gun does the same thing, but without adding a separate step. In addition, you can get the chips really, really hot by using the lower setting on the heat gun. The chips won't light when using the lower setting, but as soon as you switch to the full setting, they light very quickly.
I've posted this before, but perhaps it will help to post it here again:
Edited by johnmeyer - 10/20/16 at 5:41pm