The first episode to air since the programme parted ways with the BBC featured new presenting team Sandi Toksvig and Noel Fielding, as well as new judge Prue Leith, who joined series regular Paul Hollywood, and the arrival of ad breaks.
The show's average of 6.5 million viewers in its 8pm slot gave it a 30.4% audience share.
Jumping from BBC Two to BBC One for the fifth series in 2014, the audience numbers increased dramatically, with its debut episode enjoying 7.2 million in the overnights.
C4 nabbed rights to the ratings smasher past year after the BBC lost the contract to air it following disagreements over price with Love Productions, the United Kingdom firm behind the baking format.
However, even if the show was considered a success by many who took to social media to rave about it, official viewing figures show the new format has attracted a lot of less viewers than what the original show used to on the BBC.
Channel 4's launch saw this amount drop, as some viewers admitted they struggled to adapt to the show being on a new channel.
The show returned to screens on Channel 4 with new hosts, and a new judge, with fans flocking to crown their baking champ. Kudos to Channel 4 for knowing what they had and not being afraid to stick with it.
The figure is likely to rise higher when the official consolidated ratings are published next week, which will include people who recorded the show and watched it up to seven days afterwards.
The turnover sprung from a decision by the show's producers, Love Productions, to move the popular series from the BBC, to a commercial rival that could pay a higher fee.
Great British Bake Off starts on the 29th August and carries on for 10 weeks on Channel 4 at 8 PM.