Preheat oven 350 degrees
8" x 8" greased pan

In saucepan melt butter and add cocoa, mix well. In mixing bowl beat egg and add sugar, mixing well. Pour egg mixture in saucepan with chocolate mixture and stir well. Add flour, baking soda, and salt. Mix well. Add vanilla, chips, and walnuts; mixing well. Pour in lightly greased pan and bake for approx. 22 minutes.