In a medium mixing bowl, COMBINE cream cheese, powdered sugar, butter and vanilla; BEAT to blend; OPTIONALLY, mix in chopped walnuts.
UNROLL cake; LEAVE on towel; SPREAD cream cheese mix evenly over cake.
Using towel as an aid to prevent fingers from sticking to cake; REROLL the cake; PLACE seam side down on a platter; CHILL.
When cake is chilled, TRIM ends; WRAP cake in foil and store until ready to serve.
Before serving, DUST cake with powdered sugar; CUT cake crosswise into 1-inch-thick slices.
PREHEAT oven to 375 F.
BUTTER 13 x 9 x 5/8-in jelly roll pan; LINE pan with waxed paper; BRUSH paper with butter.
In a small mixing bowl, STIR together flour, baking powder, pie spice and salt.
In a large mixing bowl, BEAT eggs, sugar and vanilla until thick; ADD pumpkin; BEAT well; STIR in flour mixture.
SPREAD batter evenly in prepared pan.
BAKE until toothpick inserted into center of cake comes out clean, about 15 minutes.
SPREAD kitchen towel on work surface; DUST with powdered sugar
CUT around pan sides to loosen cake; turn out cake onto sugared towel, waxed paper side up; carefully PEEL off paper.
ROLL up cake and towel together, starting with narrow end; let COOL.
Per Serving (excluding unknown items): 901 Calories; 72g Fat (70.9% calories from fat); 19g Protein; 48g Carbohydrate; 1g Dietary Fiber; 273mg Cholesterol; 643mg Sodium. Exchanges: 1/2 Grain(Starch); 2 1/2 Lean Meat; 1/2 Vegetable; 13 Fat; 2 1/2 Other Carbohydrates.