A cosmological first order electroweak phase transition could explain the origin of the cosmic matter-antimatter asymmetry. While it does not occur in the Standard Model, it becomes possible in the presence of a second Higgs doublet. In this context, we obtain the properties of the new scalars $H_0$, $A_0$ and $H^{pm}$ leading to such a phase transition, showing that its key LHC signature would be the decay $A_0 rightarrow H_0 Z$, and we analyze the promising LHC search prospects for this decay in the $ell ell bbar{b}$ and $ell ell W^{+} W^{-}$ final states. Finally, we comment on the impact of the $A_0 rightarrow H_0 Z$ decay on current LHC searches for $A_0$ decaying into SM particles.
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