In medium bowl. Microwave cream cheese until soft. Add sour cream, sugar and flour. Whisk to combine and set aside.
2.
Adjust oven rack to middle and preheat oven to 325 degrees. Cut two 8" wide foil rectangles and line 8" x 8" pan, crossing the foil with edges extending over top of pan. Grease foil.
3.
In sifter, put flower, baking powder and salt. Microwave chocolate and butter until melted. Watch carefully and stir several times.
4.
Whisk sugar, eggs and vanilla. Add melted chocolate to sugar mixture and whisk. Fold in sifted flour. Set aside 1/2 c. of chocolate mixture.
5.
Transfer 1/2 of chocolate batter to pan and smooth. Spread cream cheese evenly over the top and smooth.
6.
Heat remaining chocolate a few seconds in microwave until pourable. Drop dollops of chocolate batter over cream cheese, in 6 to 8 sections. Using knife, and staying 1/2" away from edge of pan, swirl chocolate into cream cheese mixture until mixture is marbled. Do not over mix.
7.
Bake 35 - 40 minutes, until inserted toothpick comes out fairly clean. Let cool on wire rack for 1 hour. Lift from pan by foil edges and continue cooling on rack.
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