A trained pastry chef fed up with fancy restaurants, Christina Tosi hatched Milk Bar in 2008 with seed funding from her then-employer, David Chang, founder of the Momofuku noodle bar empire. Today, when the 36-year-old CEO and mastermind of Crack Pies and Compost Cookies isn’t judging on Fox’s Master­Chef, she is busy expanding her profitable bakery chain. (Momofuku still owns an undisclosed stake in Milk Bar, which operates separately.) In November, she closed a reported eight-figure funding round from RSE Ventures, which Milk Bar will use to expand locations, e-commerce operations, and product lines.