Preheat oven to 350ºF. Spray two 9x5-inch loaf pans with butter-flavored cooking spray. Set aside. Blend first 5 ingredients in a large mixing bowl. Add flour, Splenda, baking powder, and pumpkin spice. Stir well. Add raisins and walnuts. Stir until just blended. Spread batter into prepared pans. Bake 45-50 minutes or until a toothpick inserted in the center comes out clean. Cool and cut each loaf into eight thick slices. Yield: 2 loaves, 16 servings (serving size: 1 slice).