Preheat oven to 350 degrees F. Line cookie sheet with parchment or a silpat.
Stir together flour, baking powder salt and spices and set aside.
With a handheld mixer, beat the egg white until soft peaks start to form. Gradually add half of the granulated sugar and beat until thick and peaks just start to form.
In another bowl, using the electric mixer, beat the egg yolk with the rest of the sugar. With the mixer going, pour in the melted butter and continue beating, then beat in the pumpkin and vanilla.
Fold the egg white mixture into the pumpkin mixture.
Gradually add the flour mixture and stir until blended. Remove a little less than ⅓ of the dough, then stir the nuts and chips into remaining. Dampen hands and shape dough directly on a parchment lined baking sheet into 4x10 inch log. Take the reserved dough and press it evenly across the top of the log to conceal any nuts and chips.
Bake the log at 350 for about 30 minutes. Remove from oven and allow to cool for about 20 to 30 minutes. Place on a cutting board.
Reduce oven heat to 300 degrees F.
Cut the log into ½ inch thick slices. Lay slices on baking sheet cut side down. Return to oven and bake at 300 for another 25 minutes, turning about halfway through.
Let cool completely.