  We use a microcanonical path integral closely related to that introduced by
Brown and York in 1992 to add new entries to the AdS/CFT dictionary concerning
the interiors of small black holes. Stationary points of such path integrals
are also stationary points of more standard canonical-type path integrals with
fixed boundary metric, but the condition for dominance is now maximizing
Hubeny-Rangamani-Takayanagi entropy at fixed energy. As a result, such path
integrals can bring to the fore saddles that fail to dominate in more familiar
contexts. We use this feature to argue that the standard Kruskal-like two-sided
extension of small AdS black holes with energy $E_0$ is dual to a
microcanonical version of the thermofield double state for AdS black holes that
maximize the microcanonical bulk entropy at this energy. We also comment on
entanglement in such states and on quantum effects that become large when the
energy-width of the microcanonical ensemble is sufficiently small.
