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A new scalar particle, coupled to photons and gluons via loops of vector-likequarks, provides a simple theoretical interpretation of the 750 GeV diphotonexcess reported by the experiments at the Large Hadron Collider (LHC). In thispaper, we show that this model contains a large, phenomenologically viableparameter space region in which the electroweak phase transition (EWPT) isstrongly first-order, opening the possibility that electroweak baryogenesismechanism can be realized in this context. A large coupling between the Higgsdoublet and the heavy scalar, required for a strongly first-order EWPT, canarise naturally in composite Higgs models. The scenario makes robustpredictions that will be tested in near-future experiments. The cross sectionof resonant di-Higgs production at the 13 TeV LHC is predicted to be at least20 fb, while the Higgs cubic self-coupling is enhanced by 40% or more withrespect to its Standard Model (SM) value.

750 GeV Di-photon Excess and Strongly First-Order Electroweak Phase Transition