Quasars are the most luminous of active galactic nuclei ( AGN ) , and are perhaps responsible for quenching star formation in their hosts . The Stripe 82X catalog covers 31.3 deg ^ { 2 } of the Stripe 82 field , of which the 15.6 deg ^ { 2 } covered with XMM-Newton is also covered by Herschel /SPIRE . We have 2500 X-ray detected sources with multi-wavelength counterparts , and 30 % of these are unobscured quasars , with L _ { X } > 10 ^ { 44 } erg/s and M _ { B } < -23 . We define a new population of quasars which are unobscured , have X-ray luminosities in excess of 10 ^ { 44 } erg/s , have broad emission lines , and yet are also bright in the far-infrared , with a 250 \mu m flux density of S _ { 250 } > 30 mJy . We refer to these Herschel -detected , unobscured quasars as “ Cold Quasars ” . A mere 4 % ( 21 ) of the X-ray- and optically-selected unobscured quasars in Stripe 82X are detected at 250 \mu m. These Cold Quasars lie at z \sim 1 - 3 , have L _ { IR } > 10 ^ { 12 } L _ { \odot } , and have star formation rates of \sim 200 - 1400 M _ { \odot } /yr . Cold Quasars are bluer in the mid-IR than the full quasar population , and 72 % of our Cold Quasars have WISE W3 < 11.5 [ Vega ] , while only 19 % of the full quasar sample meets this criteria . Crucially , Cold Quasars have on average \sim 9 \times as much star formation as the main sequence of star forming galaxies at similar redshifts . Although dust-rich , unobscured quasars have occasionally been noted in the literature before , we argue that they should be considered as a separate class of quasars due to their high star formation rates . This phase is likely short-lived , as the central engine and immense star formation consume the gas reservoir . Cold Quasars are type-1 blue quasars that reside in starburst galaxies .