Pumpkin Pie Bars

Joy the Baker is at it again with these delicious Pumpkin Pie Bars she adapted from Kraft.

1-1/3 cups flour
3/4 cup granulated sugar, divided
1/2 cup packed brown sugar
3/4 cup (1-1/2 sticks) cold butter or margarine
1 cup old-fashioned or quick-cooking oats, uncooked
1/2 cup chopped walnuts
1 pkg. (8 oz.) cream cheese, softened
3 eggs
1 can (15 oz.) pumpkin
1 Tbsp pumpkin pie spice
1 teaspoon vanilla extract
2 teaspoons bourbon (optional)
a handful of butterscotch or chocolate chips for sprinkling on top (optional)

HEAT oven to 350°F. Line 13×9-inch pan with foil, with ends of foil extending over sides; grease foil. Mix flour, 1/4 granulated sugar and brown sugar in medium bowl; cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Stir in oats and nuts.
RESERVE 1 cup oat mixture; press remaining onto bottom of prepared pan. Bake 15 min. Beat cream cheese, remaining sugar, eggs, vanilla, bourbon, pumpkin and spice with mixer until well blended. Pour over crust; sprinkle with reserved crumb mixture and a handful of butterscotch or chocolate chips (if desired).
BAKE 25 min.; cool 10 min. Use foil to transfer dessert from pan to wire rack; cool completely.