In their first challenge, the top 24 contestants must choose from one of three mystery boxes picked by the judges.
Maggie Beer challenges the contestants to make a dish using ingredients from the MasterChef garden.
The chefs split into two teams to take over the running of the Abbotsford Convent Bakery.
In another team challenge, the contestants prepare an Italian three-course lunch for 40 guests.
Contestants try to win a Power Apron by cooking a dish using every ingredient of their mystery box.