Step 1

Preheat the oven to 350°F (180°C) then butter and line an 8x8 inch baking tray with parchment paper and set aside.

Step 2

In a large bowl add the melted butter, oil, both sugars, eggs, and vanilla.

Step 3

Using an electric hand mixer, whisk for about 5 minutes at high speed until the mixture becomes very thick. You can also do this by hand but you will just really need to give it some welly.

Step 4

Over the same bowl sift in the flour and cocoa powder. Gently fold the dry ingredients into the wet ingredients until JUST combined (do NOT over mix). Fold in half of the chocolate chunks.

Step 5

Pour the batter into the prepared pan, then smooth the top. Generously top with the remaining chocolate chunks.

Step 6

Bake for 45-50 minutes, or until the center of the brownies no longer jiggles and is JUST set to the touch.

Step 7

Remove from the oven and allow to cool to room temperature before removing from the baking tray and slicing into 16 brownies. Enjoy!