PAN Aadhaar Seeding has become the buzzword. You may do so by clicking here.
This facility is only available for those PAN holders whose mobile number/e-mail ID is registered with Aadhaar. After you click on submit button, OTP will get forwarded to your mobile number/e-mail ID registered with Aadhaar.
However, it is pertinent to note that the NSDL Website has put a disclaimer mentioning that seeding of Aadhaar is optional & voluntary for those who want to seed Aadhaar with PAN.