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["Microwave the chocolates and butter in medium microwave safe bowl 1-3 minutes or until almost melted; stirring every 30 seconds.", "Stir until smooth; let stand 5-8 minutes or until cool; stirring occasionally.", "Meanwhile, whisk flour, baking powder and salt in small bowl.", "Beat eggs and sugar in large bowl on medium-high speed 5 minutes or until pale and thick.", "At low speed, beat in chocolate mixture and vanilla until smooth.", "Beat in flour mixture just until combined.", "Stir in 1/2 cup each of marshmallows, nuts and chocolate chips.", "Cover and refrigerate for 1 hour or until firm.", "Heat oven to 350 degrees.", "Drop scant 1/4 cup dough per cookie onto parchment paper lined baking sheets, leaving about 3"" between each cookies.", "Bake 6 minutes or until cookies begin to spread and are still moist on top.", "Remove from oven.", "Carefully sprinkle remaining 1/2 cup marshmallows, nuts and chocolate chips over cookies; gently press into cookies.", "Bake an additional 5-6 minutes or until edges are firm and set but centers are still moist.", "Cool completely on parchment paper on wire rack.", "Cookies can be made 3 days ahead.", "Store in an airtight container."]