In what years did the Dallas Cowboys win the NFL championship?
This may be a trick question, but there was only one year in
which the Packers beat the Cowboys for the NFL Championship, but
they did it twice in the same year!
On Jan 1, 1967, the Packers beat the Cowboys 34-27 in the Cotton
Bowl to win the 1966 NFL Championship. On Dec 31, 1967, the Packers
again beat Dallas (21-17), this time in the infamous "Ice Bowl" to
capture the 1967 NFL Championship.