Preheat oven to 350°. In a large heavy saucepan, melt butter over medium heat. Heat 5-7 minutes or until golden brown, stirring constantly. Remove from heat. Transfer to a large bowl; cool slightly. Add sugar, pumpkin and eggs; beat until well blended.
In another bowl, whisk flour, cinnamon, nutmeg, baking soda, baking powder and salt; gradually beat into pumpkin mixture. Fold in walnuts and ginger.
Transfer to five greased 5-3/4x3x2-in. loaf pans. Place cookies, brown sugar, flour, cinnamon and nutmeg in a food processor; pulse until cookies are finely ground. Add butter; pulse until crumbly. Sprinkle cookie mixture and, if desired, walnuts over batter.
Bake 30-35 minutes or until a toothpick inserted in center comes out clean. Cool in pans 10 minutes before removing to wire racks to cool.Yield: 5 loaves (6 slices each).