Question up for Comment: Powders

If any of you have made any of the powders in the French Laundry cookbook, please let me know and share your best advice because I just tried making the tomato powder and the parchment paper caught fire in my microwave, and um, yeah... I need some advice on powders obviously. I'm gonna go do some research on my own, but I'll take any advice y'all have because burning down my house is not an option right now.

Thanks!