Soften the margarine or butter, add the cocoa, eggs and sugar.
Beat until creamy.
Add salt, vanilla, and flour.
Mix well, add nuts or baking chips if desired. Pour into a 9 by 13 inch baking dish.
Bake 350 degrees for 20-25 minutes. Or until a toothpick comes out clean near the edges of the pan.
Video
Notes
You can easily make this recipe dairy free by using a dairy free margarine like Nucoa brand. Or you can use olive oil or coconut oil if you don't like to use margarine.