Preheat oven to 180C. Prepare an 8-inch square pan and line with parchment paper. Grease the pan lightly.
Combine hot melted butter, oil and sugar together. Whisk well until combined then add the eggs and vanilla.
Sift flour, cocoa powder and salt together and gently add to the wet ingredients until just well combined.
Pour batter into the pan and add your toppings (optional). Bake for 25-30 minutes. Do a toothpick test and if it comes out with little crumbles, but not overly wet batter, it is fine. It will set while cooling to achieve the fudgy texture
Let the brownies cool before evenly slicing into 16 portions.
