When the Canadian chef Matty Matheson was growing up, first in Nova Scotia and later in Ontario, he liked going to punk shows, he didn’t do particularly well in school, and he didn’t think he was athletic or cool like his brothers. But once he moved to Toronto to study cooking, he discovered what he was great at. With no big plan or ambition, Matty became one of the best-known chefs and restaurateurs in the world. Not only are his restaurants packed every night, but his YouTube videos have hundreds of millions of views, he’s one of the executive producers of the Emmy-winning series “The Bear,” and he’s just released his third bestselling cookbook, “Soups, Salads, Sandwiches.” In a conversation with Tom Power recorded in front of a sold-out live audience, Matty shares his story and what he thinks you might be able to learn from it.