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PREHEAT oven to 350°F. Grease and flour 9x5-inch loaf pan. Microwave chocolate and butter in large microwaveable bowl on HIGH 2 min. or until butter is melted. Stir until chocolate is completely melted. Add sugars; mix well. Blend in eggs, sour cream and vanilla. Add flour, baking powder and baking soda; mix well. Stir in walnuts.
SPREAD into prepared pan.
BAKE 1 hour to 1 hour 10 min. or until toothpick inserted in center comes out clean. Cool in pan 10 min.; remove from pan to wire rack. Cool completely. Cut into 16 slices to serve.