Before the pandemic, Megan Stalter was an unknown comedian, trying to catch a lucky break at clubs in New York City. But with the arrival of COVID-19, social media became her only outlet, and she quickly found an audience with her short-form, D.I.Y. character videos,  portraying the “breadth of American idiocy,” as Michael Schulman puts it, with such accuracy and heart that it’s hard to turn away. After her rise to Internet fame—she was dubbed the “queen of quarantine”—Stalter was offered the part of Kayla, the overprivileged and clueless assistant, on HBO’s hit series “Hacks.”  It was her first acting job.  Plus, Helen Rosner joins the chef Andy Baraghani in his home kitchen for a lesson on cauliflower ragu. Baraghani, best known for his YouTube cooking videos for Bon Appetit, is out with a new cookbook called “The Cook You Want to Be.”