Fullback Trey Millard had a career-best 119 yards receiving, including a 73-yard catch that was one of two early back-breaking plays by the Sooners (4-1, 2-1 Big 12).
After Texas' second of four straight three-and-outs to start the game, Williams zipped through a hole on the right side of the line and got a smashing block from receiver Kenny Stills against Quandre Diggs to clear the way for the longest run in the rivalry's 107 games.
Millard then went hurdling over safety Mykkele Thompson to turn a short pass into a 73-yard gain and set up Bell's third score to make it 27-2.
The Longhorns were being outgained 314 yards to 14 at that point.
All that kept Texas from a completely inept first half was a botched extra-point snap by the Sooners after their first touchdown, allowing Chris Whaley to block Michael Hunnicutt's kick and Diggs to return it for a 2-point conversion.
Even when there was a tiny glimmer of hope for the Longhorns, Oklahoma quickly snuffed it out.
Davis provided the first Texas first down with a leaping 31-yard catch along the sideline, getting up and pumping his arms to try to get his teammates fired up. But on the very next play, Ash tried to go deep again and Aaron Colvin picked off his pass.
The Sooners didn't score on that drive, but Justin Brown downed Tress Way's punt at the 1-yard line and a horde of Oklahoma players converged to take down Joe Bergeron for a safety on the next play. Williams ran right through the Longhorns to set up Bell's fourth touchdown run — a 1-yarder that had him backing his way in for a 36-2 advantage.
It was a dominating performance from a Sooners squad that looked ordinary at best three weeks earlier in a home loss to Kansas State that featured three turnovers, including two critical ones by Jones.
"I think we're just cutting it loose. Whatever happens, happens," Jones said. "We're having fun out there. On the sideline, there's so much more energy."
And there was nothing Texas could do to stop it. Bell converted a fourth-and-1 to keep the first drive going, then scored on an 8-yard run in the "Belldozer" short-yardage package. He'd add three 1-yard TD runs, and Jones threw a 25-yard scoring pass to Millard and a 14-yarder to Justin Brown.
"It's going to make the bus ride relaxing. Guys are going to be laughing and joking for three hours," defensive end David King said. "Probably the best part is you see those UT buses going by.
"I know how they're feeling. It's so much better being on this side of things."