Preheat the oven to 350°F (180°C). Place the butter and chocolate morsels in the Classic Batter Bowl. Microwave, uncovered, on HIGH for 30–60 seconds, or until melted.Add the sugar and whisk to combine. Let the mixture cool for 2 minutes before adding the next ingredients.Add the yogurt, egg, vanilla, and salt, and whisk to combine. Add the flour and cocoa powder, and whisk until just incorporated. Use the Medium Scoop to place one scoop of the mixture into each well of the Ice Cream Sandwich Maker. Spread the batter evenly to the edges.Bake for 8–10 minutes directly on the center oven rack until the cookies are no longer wet and pull away from the edges slightly. Remove from the oven and cool completely.To build the ice cream sandwiches, press the frame onto one tray of the Ice Cream Sandwich Maker. Scoop ½ cup (125 mL) of ice cream into each mold and spread evenly. Once all the wells are full, invert the other pan on top of the mold and securely attach. Freeze for at least 4 hours before releasing.