Preheat oven to 375 degrees. In a large bowl beat together butter, brown sugar, eggs and vanilla until light. Beat in pumpkin. Add flour, baking powder, baking soda, salt and pumpkin-pie spice, beating until blended. Stir in chocolate chips and walnuts. Drop teaspoonfuls of batter 2 inches apart on ungreased baking sheets. Bake until edges are golden, 10 to 12 minutes. Transfer cookies from baking sheets to a wire rack and cool. Yield 6 to 7 dozen 1 1/2-inch cookies To order Nathalie Dupree Cooks Everyday Meals from a Well-Stocked Pantry, please call 1-800-582-1800.