How to Make It
Preheat a toaster oven to 350°. In a small microwave-safe bowl, heat the butter until just softened, about 10 seconds. Using a fork, blend in both sugars, the vanilla and a pinch of salt. Blend in the flour, then stir in the chocolate chunks. Scoop the batter onto a parchment paper–lined toaster tray and sprinkle with salt. Bake for 13 to 15 minutes, until lightly browned. Let cool slightly before serving.