What is Oreo cookie filling?

Oreo Filling

1 (.25 ounce) envelope unflavored gelatine

1/4 cup cold water

1 cup shortening

5 cups confectioners' sugar

1 teaspoon vanilla extract

Soften unflavored gelatine in cold water; set in heatproof cup in pan, simmering until clear. Let cool.

Cream together shortening, confectioners' sugar and vanilla extract. Add cooled gelatine mixture. Beat for 10 minutes. Put a spoonful onto one cookie. Top with another cookie, then press cookies gently together to spread the filling.