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Preheat oven to 350°F.
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Lightly grease 2 8in cake pans.
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Stir flour with baking powder, baking soda and salt.
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Beat butter with brown sugar in a separate bowl until light and fluffy.
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Beat in eggs, one at a time, add vanilla.
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Whisk 1/2 cup sour cream with milk.
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On low speed, alternately beat in flour and sour cream mixtures, in 2 additions, until batter is smooth.
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Stir in 3/4 cup chocolate chips until evenly distributed.
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Divide batter equally between the prepared pans.
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Bake 25 minutes or until a toothpick inserted in the center of each cake comes out clean.
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Cool 10 minutes, turnout onto rack to cool completely, once cooled, cut each cake into 2 layers.
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Melt remaining chocolate chips in the microwave on med for 1-2 minutes, stirring every 30 seconds.
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Stir in remaining sour cream, beat until fluffy. Chill 15 minutes or until frosting is smooth and approx as thick as peanut butter.
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Use to frost layers and top of cooled cake.