Depends on what you have changed. If it was just the recovery but not the ROM then reflashing the (correct for your software version) stock recovery would suffice. If you've rooted the ROM without making a backup first then the cleanest way is to use a HTC ROM Upgrade Utility (RUU) to completely reflash the device (which will do a factory reset in the process, so back up first).
How easy it is to find a suitable RUU depends on what model you have and what version/region/carrier.
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