Preheat oven to 400 degrees.
Butter the insides and top of a regular-sized (1/3 cup) muffin pan.
Thoroughly combine the first 8 ingredients.
In a medium bowl, beat the egg. Beat in the brown sugar, then stir in the pumpkin, oil and milk until well mixed.
Mix the pumpkin mixture into the dry ingredients until just combined. Don't overmix. Stir in the raisins and all but 2 tablespoons of the walnuts.
Spoon the batter into the muffin cups, then sprinkle the remaining walnuts on top of the muffins. Bake 15 - 17 min., or until a knife inserted in the center of a muffin comes out clean.
Let sit 2 min. before removing from pan. Serve warm or at room temperature, not hot.