Instructions: With mixer, beat margarine and sugar until creamy. Stir in flour and walnuts until mixture is crumbly. Reserve 3/4 cup crumb mixture for topping. Press remaining crumb mixture on bottom of 15 1/2 x 10 1/2 x 1-inch baking pan. Bake at 350 deg F for 15 to 18 minutes or until lightly browned.

Meanwhile, blend pumpkin, condensed milk, molasses, eggs, pumpkin pie spice and vanilla; pour over pastry crust. Sprinkle with reserved crumb mixture. Bake 30 to 35 minutes more or until set. Cool in pan on wire rack. Drizzle with powdered sugar glaze if desired. Cut into 2 1/2 x 1 1/2-inch bars. Store covered in refrigerator.

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