Heat oven to 350°F. In food processor, pulse cookies and 3 tablespoons of the sugar until cookies are crushed. Add 5 tablespoons of the butter; pulse until moistened. Line a 13 x 9 x 2-inch baking pan with foil. Press cookie mixture over the bottom of prepared pan.
Beat cream cheese, sour cream, egg and confectioners sugar in a large bowl until smooth. Spread over crust in pan. Bake at 350°F for 25 minutes.
Meanwhile, melt remaining 3 tablespoons butter in large skillet over medium heat. Add apple pieces and saute 5 minutes. In a small bowl, blend apple juice and cornstarch. Add remaining 1/2 cup granulated sugar and cornstarch mixture to skillet. Cook until bubbly and thickened.
When bar is done, pour apple mixture on top; spread smooth. Return to oven; bake 5 more minutes. Remove from oven; let cool. Refrigerate until chilled; cut in squares.