Preheat your oven to 350°F (175°C). Lightly grease an 8-inch baking pan and line it with parchment paper. Leave a bit of paper hanging over the sides for easy removal later.
In a medium bowl, whisk together the hot melted butter, oil, and sugar until well blended and slightly thickened. Add the eggs and vanilla extract, then whisk for another minute until the mixture looks lighter in color. This step helps create that shiny, crackly crust we all love.
Sift the flour, cocoa powder, and salt together. Gently fold the dry mix into the wet ingredients using a spatula. Don’t over-mix — stopping when you no longer see dry flour ensures a fudgy, dense brownie instead of a cake-like one.
Pour the batter into your prepared pan and smooth out the top evenly. If you’re adding chocolate chips or nuts, sprinkle them on now. Bake for 20–25 minutes or until the center is just set. A toothpick inserted should come out with a few moist crumbs — that’s the perfect fudgy texture.
Remove from the oven and let the brownies cool completely in the pan. Once cooled, lift them out using the parchment paper and slice into neat squares. Waiting for them to cool ensures they hold their shape and don’t crumble.