Pumpkin Pie Bars

INGREDIENTS

• 1 and1/3 cup flour
• 3/4 cup granulated sugar, divided
• 1/2 cup packed brown sugar
• 3/4 cup (1-1/2 sticks) cold butter
• 1 cup old-fashioned oats, uncooked
• 1/2 cup chopped walnuts
• 1 pkg. (8 oz.) cream cheese, softened
• 3 eggs
• 1 can (15 oz.) pumpkin
• 1 tsp cinnamon
• 1 tsp ground nutmeg
• 1 tsp ground allspice
• 1 teaspoon vanilla extract
• 2 teaspoons bourbon
• ½ cup butterscotch chips for sprinkling on top