Preparation Time: 60 minutes Serves 12 Ingredients   1 ¾ cup mashed pumpkin 1 ½ cup brown sugar ½ cup butter, softened 3 eggs 3-4 cups all-purpose unbleached flour 2 tablespoons baking powder 1 teaspoon ground cinnamon ½ teaspoon salt ½ teaspoon ground nutmeg 2 cups chopped walnuts or chocolate chips or both Method Preheat your oven to...