From The O/U: Kashering a Keurig Coffee Maker for Pesach

For those who kasher plastic:  (those who do NOT kasher plastic should put away their coffee maker for Pesach)…

1.  Clean the coffee maker and do not use for 24 hours
2. Remove the K-cup holder and perform hagalah (boiling in water) or iruy (pouring boiling water over it) on the K-cup holder.
3. Run a Kosher for Pesach K-cup in the machine (this will kasher the top pin)