2/3 c. butter
1 1/2 c. sugar (you can use brown sugar for part of it, makes it moist and chewy)
1/2 tsp. salt
1 tsp. vanilla
1/2 c. cocoa
1/2 tsp. baking powder
2 eggs
1 c. sifted flour
1 c. nuts, if desired

Blend butter, sugar, eggs. Add cocoa, baking powder and salt, then vanilla and finally flour and nuts. Pour into greased, but not floured pan and bake until toothpick inserted in center comes out clean.