Combine the melted butter and sugar in a mixing bowl. Blend well until smooth. Add the salt, vanilla, and cinnamon, and blend until smooth. Add the eggs, 1 at a time, and mix until smooth. Combine the cocoa powder and flour, and sift. Add the cocoa-flour mixture to the butter mixture and to form a batter. Add 1/2 the nuts, and blend well.
Grease a 9 by 13-inch baking dish. Pour the batter into the dish. Sprinkle the surface with the remaining 1/2-cup of nuts. Bake for 35 to 45 minutes or until set.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.