01 - 
                Heat oven to 350°F. Melt butter in microwave for 40 seconds.
              
              
              
                02 - 
                Stir melted butter with both sugars until smooth. Add vanilla and egg, mix well.
              
              
              
                03 - 
                Mix in flour, baking soda, and salt until just combined. Dough should be soft but not too sticky.
              
              
              
                04 - 
                Fold in chocolate chips, marshmallow pieces, and graham crumbs.
              
              
              
                05 - 
                Scoop 3 tablespoons dough per cookie. Place 2 inches apart on baking sheet.
              
              
              
                06 - 
                Cook 10-15 minutes until set but still soft in middle.