Gather ingredients, and preheat oven to 350 F
Spray or butter your baking dish
In a bowl add melted butter, eggs, sugar, and vanilla.
Add cocoa powder
Add your flour, salt, and baking powder.
Pour into prepared baking dish
Add walnuts, and put in oven. Bake 20 mins or until toothpick comes out clean.
Let cool. Cut.