Step 1

Heat oven to 350°F. Line 13×9-inch pan with foil, with ends of foil extending over sides; grease foil.

Step 2

Mix flour, 1/4 granulated sugar, and brown sugar (1/2 cup) in a medium bowl; cut in butter (3/4 cup) with a pastry blender or 2 knives until mixture resembles coarse crumbs. Stir in oats (1 cup) and walnuts (1/2 cup). Reserve 1 cup oat mixture; press remaining onto bottom of prepared pan. Bake 15 min.

Step 3

Beat cream cheese (8 ounces), remaining sugar, eggs (3 large), vanilla (1 teaspoon), bourbon (2 teaspoons), canned pumpkin (15 ounces), and pumpkin pie spice (1 tablespoon) with mixer until well blended. Pour over crust; sprinkle with reserved crumb mixture and a handful of butterscotch or chocolate chips (1 cup).

Step 4

Bake for 25 minutes or until the center sets; cool 10 min. Use foil to transfer dessert from pan to wire rack; cool completely.