so Im about to make some, want to clear up on some things

so is 20 min in foil at 300 degrees the general rule of thumb?
and do you physically have to wrap the whole cracker up in foil?

Thanks for help I hope this works.
MasterBaker Reviewed by MasterBaker on . Firecrackers so Im about to make some, want to clear up on some things so is 20 min in foil at 300 degrees the general rule of thumb? and do you physically have to wrap the whole cracker up in foil? Thanks for help I hope this works. Rating: 5