1¼ cup milk ¼ cup marshmallow fluff, plus more for serving 2 oz. semisweet chocolate, finely chopped 3 tbsp. creamy peanut butter Pinch Kosher salt
Heat milk in a 1-qt. saucepan over medium heat until just beginning to bubble at edges, about 3 minutes. Add remaining ingredients, let sit 1 minute and whisk until smooth. Top with additional fluff to serve.