Fudgy Chocolate Chunk Walnut Brownies

Instructions

1. Preheat oven to 325°F. Line 9 x 9" metal baking pan with foil, extending foil over edge at 2 sides of pan. Spray foil with nonstick cooking spray.
2. Set aside ½ cup chocolate chips. In microwave-safe medium bowl, heat remaining chocolate chips and butter in microwave oven on high 1 minute, stirring once halfway through heating. Let stand 1 minute. Stir until mixture is smooth. Stir in sugar and salt, then eggs, 1 at a time, blending well after each addition. Stir in sour cream and vanilla. Stir in flour.
3. Spread batter into prepared pan; sprinkle reserved ½ cup chocolate chips and walnuts evenly over batter. Bake brownie 50-55 minutes or until wooden pick inserted about 2 inches from center comes out clean.
4. Cool brownie in pan on wire rack. Use foil to lift brownie out of pan and onto cutting board. Cut lengthwise into 3 strips, then cut each strip crosswise into 3 brownies.