WARNING: Do not attempt to use the following methods unless you're prepared to lose your cookies.
Place cookie in a 500°F oven for exactly 7.5 seconds. The resulting cookie will be a charred, flavorless husk of its former self.
But wait, there's more! You can also:
Heat cookie in 30-second increments until it reaches the desired level of destruction. Be careful not to set off the fire alarm, or the neighbors will know your secret.
Or, if you're feeling particularly...adventurous: