01 -
Preheat oven to 350°F and grease an 8×8 inch baking pan thoroughly.
02 -
In a mixing bowl, blend vegetable oil or melted butter with unsweetened cocoa powder and granulated sugar until the mixture is smooth and uniform.
03 -
Add eggs and vanilla extract to the mixture and stir until fully integrated.
04 -
Fold in all-purpose flour and salt, mixing gently until just combined to avoid overworking the batter.
05 -
If desired, fold in chocolate chips and chopped walnuts evenly throughout the batter.
06 -
Pour the batter evenly into the prepared pan and bake at 350°F for 18 to 20 minutes, or until a toothpick inserted in the center comes out clean.