Whisk the eggs and sugars

• In a bowl, whisk the eggs, egg yolk, powdered sugar and brown sugar vigorously until smooth and the powdered sugar has completely dissolved.
• This is how you get the shiny crinkly top.

Add the wet ingredients

• Add the melted butter, oil and coffee powder.
• Whisk until well combined.

Fold in the dry ingredients and oreos

• Add the flour and cocoa powder and fold gently using a spatula.
• Mix in the chopped oreos.

Bake

• Transfer the brownie batter to a parchment lined 8x8 pan.
• Top with more oreos.
• Bake in a preheated oven at 180 °C until the edges are set and the center still looks a little soft. Underbaking is better than overbaking.

Cool and slice

• Cool completely before slicing.
• Or chill in the fridge for the best texture.