The female lead of the Harry Potter movies has grown up quite a bit since she first auditioned for the role of Hermione Granger seven years ago. And to prove it, she talked to Conan O’Brien about her “magic muffins” on last night’s show. “It’s muffin mix,” she says. “I was in Waitrose [a U.K. chain of supermarkets] the other day and I came across ‘Hermione’s Magic Muffins.' I’m an awful cook and I would never, ever do that, but you don’t have to buy any of the ingredients. It’s all there.” Now which aisle can we find the person who’s going to mix it all together for us?