Step 1

Heat oven to 350°F.

Step 2

Beat margarine and sugar in small bowl with electric mixer on medium speed until well blended. Add flour and walnuts; stir until mixture is well blended and crumbly. Remove 3/4 cup of the walnut mixture; set aside for later use. Press remaining walnut mixture firmly onto bottom of 15x10x1-inch baking pan. Bake 15 to 18 min. or until lightly browned.

Step 3

Mix pumpkin, condensed milk, molasses, eggs, pumpkin pie spice and vanilla until well blended; pour over crust. Sprinkle with reserved walnut mixture.

Step 4

Bake an additional 30 to 35 min. or until pumpkin mixture is set. Cool in pan on wire rack.

Step 5

Mix powdered sugar with milk; drizzle over bars. Cut into 36 bars to serve. Store in tightly covered container in refrigerator.