4 (1 ounce) squares – unsweetened chocolate
1 cup – butter
2 cups – white sugar
3 – eggs
1 tsp – vanilla extract
1 cup – all-purpose flour
1 1/2 cups – chopped walnuts
1 cup – semisweet chocolate chips
Melt butter and 4 squares unsweetened chocolate in a medium size saucepan over moderate heat. Remove from heat.
Preheat oven to 350 degrees F (175 degrees C).
Beat in sugar gradually with a wooden spoon until thoroughly combined.
Add eggs, one at a time, beating well after each addition; stir in vanilla.
Stir in flour until thoroughly combined. Stir 1 cup of the walnuts.
Spread into greased 13 x 9 x 2 inch pan.
Combine remaining 1/2 cup walnuts with chocolate chips; sprinkle over top of brownie mixture, pressing down lightly.
Bake in a preheated oven for 35 minutes or until top springs back when lightly pressed with fingertip.
Cool completely in pan on wire rack. Cut into bars or squares.