We are studying microflares (A, B-C class flares) in active regions using coordinated observations from Hinode and RHESSI. Hinode/EIS has unprecedented diagnostic power for small, transient activity in the solar corolla., providing temperature, density, and velocity information. For this purpose, we designed and ran an EIS observing sequence to provide high-cadence data at both transition region and coronal temperatures. A preliminary analysis of these observations is reported, with one data set given as an example.