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The Galactic Center Excess (GCE) is explained in the framework of theNext-to-Minimal Supersymmetric Standard Model (NMSSM) with a $Z_3$ discretesymmetry. We show that a resonant CP-odd Higgs boson with mass twice that ofthe Dark Matter (DM) candidate is favoured. Meanwhile, the DM candidate isrequired to have relatively large coupling with the $Z$ boson through itsHiggsino component in order to obtain correct DM relic density. Its LHCdiscovery potential via four signatures is discussed in detail. We find thatthe most sensitive signals are provided by the Higgsino-like chargino andneutralino pair production with their subsequent decays into $W$ bosons, $Z$bosons, and DM. The majority of the relevant parameter space can be probed atthe Large Hadron Collider with a centre-of-mass energy of 14 TeV and anintegrated luminosity 1000 fb$^{-1}$.

NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches