Tosi is the co-owner of the Momofuku Milk Bar which produced baked goods for five retail outlets in New York City and one more in Toronto, Canada. She is also a cookbook author and teacher and is now a judge on the reality television series MasterChef. Tosi won the 2012 James Beard Rising Star Chef Award and was a finalist for the 2014 Outstanding Pastry James Beard Award for Rising Star Chefs.