Stir 1 1/2 cups marshmallows and 1/2 cup chopped walnuts into 1 pk. melted cocoa candy. Spoon onto waxed paper-covered Cake Circles, making ovals approx. 3 1/2 x 3 x 1 1/4 in. high. Let set 5-10 minutes; attach castle at center with melted candy. Draw facial features on ghost sprinkles with black FoodWriter. Attach to ovals and castle with melted candy; let set. Place treats in bags.