  We investigate the potential of the channel {\em mono-Higgs + MET} in
yielding signals of dark mater at the high-luminosity Large Hadron Collider
(LHC). As illustration, a scalar dark matter in a Higgs portal scenario has
been chosen, whose phenomenological viability has been ensured by postulating
the existence of dimension-6 operators that enable cancellation in certain
amplitudes for elastic scattering of dark matter in direct search experiments.
These operators are found to have non-negligible contribution to the mono-Higgs
signal. Thereafter, we carry out a detailed analysis of this signal, with the
accompanying MET providing a useful handle in suppressing backgrounds. Signals
for the Higgs decaying into both the diphoton and $b{\bar b}$ channels have
been studied. A cut-based simulation is presented first, followed by a
demonstration of how the statistical significance can be improved through
analyses based on Boosted Decision Trees and Artificial Neural Network. The
improvement is found to be especially noticeable for the $b{\bar b}$ channel.
