You don’t, unless you would like them without psilocybine. Psilocybine breaks down rapidly when reaching hot temperatures as in cooking or boiling. You can make tea out of them if you don’t want to eat them raw, but you shouldn’t use boiling water.
Be sure there is someone you trust and who is sober stay with you during the day you use. It’s effects can last 8 hours and you might bring yourself in harm’s way when you are under the influence of psilocybin.