Ingredients: -
1/2 cup butter, melted and hot
1 Tbsp cooking oil
1 1/8 cup caster sugar
2 large eggs
2 tsp pure vanilla extract
1/2 cup all purpose (or plain) flour
1/2 cup cocoa powder
1/4 tsp salt 
Melted chocolate, to drizzle over the top (optional)
METHOD: -
Preheat oven to 175°C.
Lightly grease an 8-inch square baking pan with cooking oil spray. Line with baking paper; set aside.
Combine hot melted butter, oil and sugar together in a medium-sized bowl. Whisk well for about a minute. Add the eggs and vanilla; beat until lighter in colour (another minute).
Sift in flour, cocoa powder and salt. Gently fold the dry ingredients into the wet ingredients until JUST combined (do NOT over beat as doing so will affect the texture of your brownies).
Pour batter into prepared baking pan, smoothing the top out evenly. (OPTIONAL: Top with chocolate chunks or chocolate chips).
Bake for 20 to 25 minutes, or until the centre no longer jiggles and is just set to the touch. The brownies will continue to cook slightly as they cool in the hot pan. 
Test with a cake tester or skewer. For fudgy brownies, it should come out with a few moist crumbs attached rather than completely clean.
Remove from the oven and allow the brownies to cool completely before slicing.

If desired, drizzle melted chocolate over the top before serving and serve with whipped cream.