Pumpkin Nut Bars with Orange Icing

1/2 cup butter or margarine
1 cup packed brown sugar
1 cup all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon baking powder
1 teaspoon cinnamon
1/4 teaspoon nutmeg
1/4 teaspoon ginger
2/3 cup canned pumpkin
2 eggs
1 teaspoon vanilla extract
1/2 cup chopped nuts

Combine all ingredients except nuts. Beat in mixing bowl. Fold in nuts; spread dough in greased 9 x 13-inch pan. Bake at 350 degrees F about 20 to 25 minutes. Ice with orange icing.

Orange Icing
1 1/2 cups sifted confectioners' sugar
2 tablespoons butter
1 tablespoon grated orange peel
2 tablespoons orange juice
Orange paste food coloring

Combine ingredients, using food coloring to deepen color of icing. Cut into bars.