The competition is anything but sweet on the second season of Bravo's Top Chef: Just Desserts.

Judges Gail Simmons and Johnny Iuzzini recently stopped by Us Weekly's NYC offices to explain how they co-create challenges for the aspiring pastry chefs.

"We all spend a lot of time with our producers sort of going over the ideas they have in mind, tweaking them and commenting on them," Simmons said.

Using Iuzzii's "expert eagle eye," Simmons said the tasks are carefully designed so that "the pastry chefs will not only be challenged, [but also] do something that they've never done before."

The results, Simmons told Us, are out of this world. "Every week, I am blown away when we walk into that studio and we get anything at all," she laughed. "The amount of stress we put on them -- it's extraordinary what they come up with."

Added Iuzzini: "We've said it a million times: just because you're a great chef, that doesn't make you a great competitor. It's so different."

Top Chef: Just Desserts airs Wednesdays at 10 p.m. EST on Bravo.