  Kagome metal CsV$_3$Sb$_5$ has attracted much recent attention due to the
coexistence of multiple exotic orders and the associated proposals to mimic
unconventional high temperature superconductors. Nevertheless, magnetism and
strong electronic correlations -- two essential ingredients for unconventional
superconductivity, are absent in this V-based Kagome metal. CsCr$_3$Sb$_5$ is a
newly discovered Cr-based parallel of CsV$_3$Sb$_5$, in which magnetism appears
with charge density wave and superconductivity at different temperature and
pressure regions. Enhanced electronic correlations are also suggested by
theoretical proposals due to the calculated flat bands. Here, we report
angle-resolved photoemission measurements and first-principles calculations on
this new material system. Electron energy bands and the associated orbitals are
resolved. Flat bands are observed near the Fermi level. Doping dependent
measurements on Cs(Cr$_x$V$_{1-x}$)$_3$Sb$_5$ reveal a gradually enhanced band
renormalization from CsV$_3$Sb$_5$ to CsCr$_3$Sb$_5$, accompanied by distinct
spatial symmetry breaking states in the phase diagram.
