[Q] How do I perform the OTA update to Lollipop when rooted? topic

I recently unlocked the bootloader of an HTC One (M8) running Kitkat, installed TWRP then flashed a .ZIP file to root the phone. Now Lollipop has been released there's an OTA available on the phone but I'm not able to update through it. I've seen different posts all over the place about how you have to just install the stock recovery or how you have to use an RUU or how you have to use a NANDroid backup so the opinions are quite conflicting.

I basically just want the phone to run the stock unrooted version of Android so I'm able to perform the official OTA updates to Lollipop so how do I go about this? Any help is greatly appreciated!