I think I married your wife's sister! LolI had my wife cook dinner, after she messed that up I took a knife and scraped the burnt pan for a couple hours. I then took some Elmer’s glue and spread that on the glass with a butter knife and proceeded to put the burnt stuff on the back.
Not a professional job, but it did the trick. I just have a few spots I need to touch up. I’m in no rush though, I try and have her avoid the kitchen.