The series, co-written by Phil Bowker and Samson Kayo (Timewasters), will be extended to six episodes.
Sliced follows the hilarious, unlikely encounters of Joshua (Kayo) and Ricky (Theo Barklem Biggs), two mischievous pizza delivery drivers in south London.
Kayo commented: “We go again! I’m so excited to be back on Dave with series two. Last series was just a taster, now it’s go time!
“I’m looking forward to creating some more explosively funny and authentic stories with this amazingly talented team."