Both students said they were excited about the competition.
Alyse said she wanted to do something to "get out of my comfort zone".
Libby said she had had the opportunity to take part in similar competitions, but hadn't followed through.
"I'm really excited to see what it will be like," she said.
Libby and Alyse began by making their dishes for Mr Healy, and then discussing them with him to decide what could be changed or improved.
"It's their own dish, but I'm teaching them a few tips and tricks," he said.
Mr Healy said the competition was open to any secondary school student in Whanganui, Manawatu and Horowhenua.
Two other Whanganui Girls' College students are taking part in the competition, but in a different category. Nicole Ede and Dakota Barry are currently testing recipes for the muffin category.