Remember “Fahrenheit 451” That’s the temperature at which paper burns. A broiler frequently gets hotter than that, at least in some areas. I wouldn’t advise it under a broiler. You could bake if your oven’s thermostat is accurate. Baking at 350 certainly wouldn’t ignite it. It might emit a smell of cooking paper—yes, there is one, because we’ve occasionally dried a newspaper that got wet.