The stars of Theresa Rebeck’s Seminar celebrated a Broadway milestone in the sweetest fashion on February 15: Hamish Linklater, Hettienne Park, Lily Rabe, Alan Rickman and Jerry O’Connell rang in their 100th performance with delicious goodies from Insomnia Cookies. In the show, Rabe’s character Kate takes solace in a batch of homemade cookie dough (among other treats) after her work is annihilated by the acclaimed writer Leonard (Rickman). Check out the photo and then see this cookie-loving cast live at the Golden Theatre!