1Heat oven to 350ºF. Spray 9-inch glass pie plate with cooking spray.
2In medium bowl, stir pumpkin, Bisquick mix, sugar, milk, butter, 1 1/2 teaspoons pumpkin pie spice, the vanilla and eggs until blended. Stir in chopped pecans. Pour into pie plate.
3Bake 35 to 40 minutes or until knife inserted in center comes out clean. Cool completely, about 1 hour.
4Stir whipped topping and 1/4 teaspoon pumpkin pie spice. Garnish pie with topping and pecan halves. Store covered in refrigerator.