Slice Twinkies in half lengthwise and place cream-side up, in single layer in 9 x 13-inch baking dish. Using a mixer, blend together cream cheese, powdered sugar and 1/2 of whipped topping until smooth. Spread evenly over Twinkies. Combine pudding mix, pumpkin, pumpkin pie spice and milk. Whisk until well blended and layer over cream cheese mixture. Carefully spread remaining whipped topping over pumpkin. Lightly sprinkle with pumpkin pie spice. Refrigerate several hours or until set.