Aaron Rodgers produced a typical Rodgersesq game last Thursday against the Eagles. He was going against a battered Eagles secondary, though, and that game was an exception to how Green Bay's offense has performed this year. Matt LaFleuer has largely hijacked the Packers' offense with his commitment to run the ball more even though this isn't Green Bay's strength.  
Green Bay's offense has mostly struggled against the two elite defenses it has faced, Chicago and Minnesota, scoring an average of 15.5 points versus those two teams. Dallas' defense also is very good ranking third in fewest points given up. The Cowboys have four premier defenders in pass rusher DeMarcus Lawrence, cornerback Byron Jones and linebackers Leighton Vander Esch and Jaylon Smith. The Packers could be without their top playmaker Davante Adams and right tackle Byron Bulaga, who has been the Packers' best offensive lineman this season. 
The Packers have one of the most improved defenses in the NFL. Their secondary is above average now due to upgraded safety play. The additions of Preston Smith and Za'Darius Smith have improved their pass rush. Their run defense should be better now that underrated defensive lineman Montravius Adams is expected to play after missing the past two games. Adams is the reason the Packers felt strong enough to cut Mike Daniels.
The Cowboys aren't going to do anything fancy. They are going to pound away with Ezekiel Elliott and play ball control keeping Rodgers off the field as much as possible.