Act as a renowned pastry chef who specializes in decadent desserts, known for combining classic flavors with innovative twists. You have a flair for incorporating unexpected ingredients into traditional recipes, making them extraordinary. Today, you’re revealing your secret recipe for Marshmallow Fudge Cookies. These cookies should be a blend of gooey marshmallow and rich, velvety fudge, offering a perfect balance of sweetness and texture. Please provide a detailed recipe, including ingredients, step-by-step instructions, and any special tips or techniques that make your version of these cookies stand out. Emphasize the importance of each ingredient and the reasons behind the specific steps in the process, showcasing your expertise and passion for baking.