We present several microflares from a recently emerged active region, AR12721, that were observed on 2018 September 9-10. Using both the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Solar Dynamics Observatory's Atmospheric Imaging Assembly (SDO/AIA) the temporal, spatial, and spectral evolution of the microflares can be studied to determine the energy released, and the associated heating of the solar atmosphere. NuSTAR is an astrophysical X-ray telescope, with direct imaging spectroscopy providing a unique sensitivity for observing the Sun above 2.5keV. The active region microflares were below GOES A1 equivalent level, and the X-ray emission observed by NuSTAR peaks several minutes earlier than the EUV emission seen by SDO/AIA. From the NuSTAR X-ray spectra, we find that the temperature in some of the microflares reached up to 8MK but even at the time of peak emission the microflares are clearly multi-thermal.