Preheat oven to 375 degrees. Place cornmeal in a bowl. Sift flour, baking powder and salt into bowl with cornmeal and mix the ingredients. To the beaten eggs add the sugar, melted butter, melted chocolate ingredients to the egg mixture. Beat well. Mix chopped nuts and pour into two greased and floured 8-inch square pans. Bake 25 to 30 minutes. Cool before cutting into squares. These are better served hot.