1Heat oven to 375ºF. Grease bottom and sides of rectangular pan, 13x9x2 inches. Beat flour, butter, granulated sugar, 1/3 cup corn syrup and the salt in large bowl with electric mixer on low speed until dough forms. Press evenly in pan.
2Beat cream cheese in medium bowl on medium speed until smooth. Beat in eggs until well blended. Beat in 1 cup corn syrup and the vanilla until smooth. Pour over dough.
3Bake 35 to 40 minutes or until edges are light golden brown and filling is set (filling may appear puffy.) Stir preserves; spread over hot bars. Refrigerate at least 3 hours until chilled.
4For 64 bars, cut into 8 rows by 4 rows; cut bars diagonally in half. Sprinkle with powdered sugar just before serving. Store covered in refrigerator.