A hat-trick from Scott Vernon and goals from Joe Shaughnessy and Cammy Smith sealed Aberdeen's passage into the quarter-final.
Jonny Hayes grabbed a double and Peter Pawlett and Adam Rooney also got themselves on the scoresheet to send Aberdeen to their first League Cup final since 2000.
[8] In the next round Inverness CT faced fellow Scottish Premiership team Dundee United at the Caledonian Stadium.
Greg Tansey put the Highlanders ahead shortly after half time, but a double from Jamie Hamill swung the game in the favour of the Edinburgh side.
Nick Ross scored a dramatic injury time equaliser despite Caley having Gary Warren and Josh Meekings sent off.