I'm not sure if this is "the Debian way" to do it, but:
You should have an
/etc/pam.d/sudo file which specifies which PAM modules sudo will use for authentication (and other stuff) -- Find the module for your one-time password magic and comment it out. The lines you're looking for probably look something like:
auth sufficient pam_opie.so no_warn no_fake_prompts
auth requisite pam_opieaccess.so no_warn allow_local
On Debian systems a lot of PAM configurations reference
common-* files -- If that's the case copy the contents of those files in place of the
Sage advice: Launch screen & su to root inside it before you start editing so you have a root shell to fix stuff if you need it; Also obviously make a backup of the original file so you can get it back if you need to.