Preheat oven to 375 degrees F.
With an electric mixer, beat the brown sugar, eggs, shortening, and pumpkin.
In a separate bowl, whisk flour, baking powder, cinnamon, nutmeg and salt.
Slowly add dry ing. to pumpkin mixture.
Beat well. Fold in walnuts by hand.
With a 2 in. scoop, put onto cookie sheets.
Bake 12 - 15 min.
Cookies are done when tops crack and bottoms are lightly browned.
Ice when completely cool.
Icing: Stir 1/2 cup softened butter with 1 1/2 cups powdered sugar. Add 2 tablespoons milk. Stir until smooth. Add more milk, 1 tablespoon at a time, until desired consistency.