In a large mixing bowl, combine the softened cream cheese and the pumpkin pie spice. Beat at medium speed until smooth.
Add half the can of sweetened condensed milk. Beat with well, until it is well incorporated. Taste the filling and if you think it needs more condensed milk, add some. The sweetness of the filling is a personal choice.
Using a spoon, pastry bag or a ziplock bag with the corner cut for piping, place approximately 2 tsps of the filling onto the bottom-side of 1 cookie/wafer. Top with another cookie, bottom-side down.