Preheat oven to 375 degrees F . Grease a 15x10x1 inch baking pan and line with parchment paper. Grease and flour the paper.

In a large bowl, beat eggs on high for five minutes. Gradually add white sugar and pumpkin. Add flour, cinnamon, and baking soda. Spread batter evenly in pan. Sprinkle walnuts evenly on top if desired.

Bake at 375 degrees F for 15 minutes or until cake springs back when lightly touched. Immediately turn out onto a linen towel or parchment paper dusted with confectioners sugar. Peel off original paper and roll cake up in the towel, starting with the short end. Cool.

To Make Filling: Mix confectioners sugar, vanilla, butter or margarine, and cream cheese together till smooth.

Carefully unroll the cake. Spread filling over cake to within 1 inch of edges. Roll up again. Cover and chill until serving. Dust with additional confectioners' sugar, if desired.