The 22-year-old, from Forfar, will partner Adam Balon in a Lamborghini Huracan Evo GT3 prepared by Barwell Motorsport and the duo are determined to better their top three finish in the campaign last season.
The team aim to use their previous experience in the race but know how tough the opposition will be.
“I’m really looking forward to racing again in the British GT Championship,” Mitchell, who won the title back in 2020, said.
“It’s also great to be partnering again with Adam and Barwell in 2022.
“The British GT Championship is probably the toughest national title in Europe and we know we’re going to face some fierce competition over the nine races spread out over seven weekends.
“There’s a bumper 32-car entry in the championship this season, which simply highlights how important the teams and drivers believe the championship is.”
Mitchell, partnered by team-mate Balon, bagged a podium position at a rain-lashed Oulton last season.
And the Angus racer is determined to at least replicate that feat when the duo tackle the two 60-minute races at the 2.69-mile, 17-turn parkland Oulton Park circuit on Easter Monday.
“We’ve tested well in pre-season so we know the car’s quick,” Mitchell add.
"Adam and I forged a really strong partnership which grew stronger and stronger as the 2021 season unfolded.
“We were able to take the fight tor the championship right to the final race, despite not scoring in the opening round when the car was taken out by a rival.
“We both know each other’s strengths and we’re definitely be in a position to start the season stronger in 2022.
"I can’t wait to get back on-track on Saturday.
“And as the new British GT season starts, I’d like to thank my sponsors, Tunnocks, Thorntons, Lamborghini Edinburgh, Upper Dysart Larder and Alan Davie Transport whose combined support ensures I have the strongest package to mount a full-on bid to win the title again this year.”