This site has compiled a list of works of Adi Shankara and divided them into which are considered authentic and doubtful by scholars. The following are the works which are considered authentic:
Philosophical Works: Considered Authentic:
upadeSa sahasrI (because it’s concept matches Brahmasutra and ajata vada)
Atma bOdh - Commentary (Tika) by svAmI madhUsudan sarasvatI, hence authentic.
viveka cUuDAmaNI – Commentary by Sri candraSekhara bhArati, SankarAcArya of Sringeri, hence confirmed. John Grimes in his scholarly way has refuted the reasons for not accepting viveka chUDAmaNi as not authored by AdI Sankara in his book. 1
vAkya Vritti - Quoted by srI vidyAraNya svAmI in PanchadaSI 7.71-78 relating to vAkyavRRitti verses 44, 45, 46, 47, 38, 39, 40, 41
aparOkshAnubhUtI - aparOkshAnubhUtI TIkA by srI vidyAraNya svAmI
praSnottara ratnamAlIka - Basic important text, in simple and short Q & A format, some say it was written by Adi Sankara but some sloka-s were added later by his followers. Advaitins reject this claim.
And these are the ones which are seen as doubtful:
Philosophical Works: Authenticity doubtful
While these are accepted by western scholars, they discard some popular works like
tatva bOdh - Basic Text, considered very important
panjikaraNa - Important work, dealing with creation and Advaita, work attributed to vidyAraNya svAmI
prabOdha sudhAkara - stresses on surrender to krishna and vairAGYa, two forms of Brahman, kruShNa and nirguNa.