1In 1-quart saucepan, heat raisins and rum to simmering over medium heat. Remove from heat; let stand 15 minutes.
2Heat oven to 350°F. Spray 9-inch square pan with cooking spray. In medium bowl, beat butter, 1/4 cup of the granulated sugar and the vanilla with electric mixer on medium speed until well blended. On low speed, beat in flour until soft dough forms. Press in bottom of pan. Bake 10 to 15 minutes or until center is set.
3Meanwhile, in large bowl, beat cream cheese and remaining 3/4 cup granulated sugar with electric mixer on medium speed 1 to 2 minutes or until creamy. Add eggs, one at a time, beating until blended. Stir in raisins and any rum remaining in saucepan. Pour over partially baked crust. In small bowl, mix sour cream and brown sugar. Drop sour cream mixture by tablespoonfuls randomly onto cream cheese filling. Swirl sour cream mixture through filling with knife for marbled design.
4Bake 25 to 30 minutes or until set. Cool completely in pan on cooling rack. Refrigerate 2 hours or until chilled. Cut into 4 rows by 4 rows. Store covered in refrigerator.