firecrackers HELP!

hello, I have tried making firecrackers from the 320 back for 25 minutes method in tin foil but every time i do it the crackers are burnt black every time i take them out and they taste like absolute shit............ what can I do or what do i do wrong?

try 350F for 15 minutes. tried and true. works for me. there was even a tutorial video about it on some website.

preheat, then bake for 15 minutes. nothing's burnt, just nicely baked.