Photo / Jessica Siskin
Ms Siskin came up with the idea when she needed to make a dessert for a friend's potluck last fall, and settled on a Rice Krispie Treat.
"I don't know how to cook anything besides Rice Krispie Treats," she said.
She baked the treat in the shape of a surfboard, following a recipe she found online that required food coloring.
Soon after, she began whipping up other Rice Krispie Treat designs, and launched Mister Krisp - named for a character in Sister Act 2: Back in the Habit.
Ms Siskin, who previously worked at Elizabeth and James, Mary-Kate and Ashley Olsen's fashion line, also has plenty of sartorially inspired treats, such as Rice Krispie blue jeans and an Hermes Kelly bag.
"They've been so supportive," she says of the Olsen twins, adding that Elzabeth and James sent Mister Krisp snowmen to the brand's top customers for the holidays.
Photo / Jessica Siskin
While she doesn't list prices for the items pictured on her Instagram account, she includes an email address where customers can place orders and request more information.
She'll also do custom designs for those who ask.
"Let's just say I've done some interesting designs for bachelorette parties," she jokes.
Each treat typically takes between 40 minutes and two hours to make.
Ms Siskin told the fashion site Bib and Tuck that her favorite Krisps are those masquerading as other foods.
"It's hard to choose but the cheese plate and Snickers bar are up there," she said.
"I'm consistently inspired by pop culture and always trying to think of quirkier ways to address the zeitgeist in Krisp form."
- Daily Mail
