Beat cream cheese until fluffy.
Gradually beat in sugar.
Add egg. Blend until smooth. Stir in flour, sugar, cocoa, baking soda and salt.
Beat together water, oil, vinegar and vanilla.
Gradually add flour to flour mixture, blending well.
Turn into a greased 9" square baking pan.
Drop cream cheese mixture by spoonfuls over batter.
Sprinkle with chocolate pieces and walnuts.
Bake at 35~ for 3-5 minutes until cake tester comes out
clean and top springs back when touched.
Cool on wire rack. To serve, cut into squares from pan.