Robinson finished with 23 completions in 27 pass attempts for 250 yards and his two first-half touchdown passes staked OSU to a 17-0 lead at the break.
Running back Beau Johnson rushed for 93 yards on 22 carries, while Hubert Anyiam caught nine passes for 83 yards for the Cowboys (6-1, 3-0), who have won five in a row since the 45-35 loss to Houston on Sept. 12.
They had a 445-284 advantage in yards gained.
Baylor quarterback Nick Florence completed 21-of-35 for 235 yards, one touchdown and one interception.
David Gettis scored once after four catches for 62 yards, while Justin Akers added five receptions for 62 yards for the Bears (3-4, 0-3), who have lost their last three contests.