  We study the collider phenomenology of the extended Higgs sector of the
Next-to-Minimal Supersymmetric Standard Model (NMSSM). The region of NMSSM
parameter space favored by a 125\,GeV SM-like Higgs and naturalness generically
features a light Higgs and neutralino spectrum as well as a large
$\mathcal{O}(1)$ coupling between the Higgs doublets and the NMSSM singlet
fields. In such regimes, the heavier Higgs bosons can decay dominantly into
lighter Higgs bosons and neutralinos. We study the prospects of observing such
decays at the 13\,TeV LHC, focusing on mono-Higgs signatures as probes of such
regions of parameter space. We present results in a model-independent framework
as well as in the NMSSM. In the NMSSM, we find that the mono-Higgs channel can
probe TeV scale Higgs bosons and has sensitivity even in the low tan$\beta$,
large $m_A$ regime that is difficult to probe in the MSSM. Unlike for many
conventional Higgs searches, the reach of the mono-Higgs channel will improve
significantly with the increased luminosity expected to be collected at the LHC
in the ongoing and upcoming runs.
