Ppreheat oven to 350 and coat 10 x 15in baking dish with cooking spray.
Using electric mixer 0 in a large bowl mix butter (apple sauce) and sugar. Add eggs, pumpkin beat well. Add salt, pumpkin pie spice, flour, oats and baking soda. Mix thoroughly. Pour batter into baking dish and place walnuts ontop. Bake 40-45 minutes. Cool and cut into 24 pieces.