HEAT oven to 350ºF.
MIX flour, dry pudding mix, baking powder, spice and baking soda; set aside.
WHISK butter, sugar and pumpkin in large bowl. Blend in eggs. Add flour mixture; stir just until dry ingredients are moistened. Pour into 8×4-inch loaf pan sprayed with cooking spray; top with nuts.
BAKE 1 hour to 1 hour 5 min. or until toothpick inserted in center comes out clean, covering loosely with foil for the last 20 min. Cool bread in pan 10 min. Remove from pan to wire rack; cool completely.