damn that was such a disappointment.. i opened the tin foils and my crackers were all burnt to shit

don't know how this happened, followed the instructions perfectly (160 celsius + 22 mins + 15 seconds microwave). i don't know anything about cooking in general, i couldn't find a "bake" option on my oven so i just went for it anyway. anyone know what i could have possibly done wrong? the chocolate inside literally turned into charcoal