Preheat your oven to 350°F.

Lightly grease an 8-inch square baking pan and line it with parchment paper.

In a medium-sized bowl, whisk together the hot melted butter, oil, and sugar for about one minute.

Add the eggs and vanilla extract to the bowl and beat until the mixture is lighter in color, approximately one minute.

Sift the flour, cocoa powder, and salt into the wet ingredients. Fold gently until just combined, being careful not to overmix.

Transfer the batter to the prepared baking pan, smoothing the top evenly.

Bake in the preheated oven for 20-25 minutes. The brownies are done when the center is set but still slightly jiggly.

Remove from the oven and let cool to room temperature before slicing into 16 pieces.