  We leverage the CP violation in charged $B$ meson decays to generate the
observed baryon asymmetry and dark matter at $\mathcal{O}(10 \text{ MeV})$
temperatures. We realize this in two scenarios: $B_c^+$ Mesogenesis and $B^+$
Mesogenesis. In the first, CP violating $B_c^\pm$ decays to $B^\pm$ mesons are
followed by decays to dark and Standard Model baryons. In the second, CP
violating $B^\pm$ decays to lighter charged mesons are accompanied by the
latter's decays to dark and Standard Model leptons, which then scatter into the
baryon asymmetry. $B_c^+$ Mesogenesis is actively being probed at Belle and
LHCb, while $B^+$ Mesogenesis can be tested at colliders and sterile neutrino
searches.
