Prepare whoopie pies: Beat all ingredients in a bowl with a mixer on medium speed 3 minutes, or until batter is smooth. Let batter rest 30 minutes.

Heat oven to 400 degrees F. Line several cookie sheets with parchment paper. Drop level 1 1/2 tablespoons of batter into mounds on baking sheets, spacing them 3 inches apart (6 to 8 mounds per sheet; you will get 24 mounds).

Bake each sheet 11 minutes, or until cakes are puffed and a pick inserted into centers comes out clean. Transfer to a wire rack and cool completely. Bake remaining cakes.

Prepare filling: In a large mixer bowl, cream together butter and sugar until fluffy. Add Marshmallow Fluff, cream cheese, and orange extract; continue mixing until blended. Tint filling a pale orange with food coloring.

To assemble pies spread the flat side of 1 cake with 2 tablespoons of the filling; top with another cake, pressing down gently to distribute the filling evenly.

To make Spiderweb Glaze, mix ingredients in a small bowl until thick and smooth. Transfer glaze to a small zip-top food-storage bag. Snip off a corner of bag and pipe a spiderweb design on top of each whoopie pie. Let glaze dry until hardened.