Prepare: Preheat the oven to 160°C fan/180°C/350°F/Gas Mark 4 and line a 20x20cm cake tin with parchment paper.
Melt the chocolate and butter: Add the chocolate chips and butter to a heatproof bowl and melt together in short bursts in the microwave, stirring between each burst until smooth. Leave to cool for a few minutes. (You can also do this in a bowl sitting on top of a pan with a few centimetres of simmering water, just make sure the water doesn’t touch the bottom of the bowl.)
First whisk: In a separate large bowl, whisk the sugar, eggs and vanilla together with a handheld whisk for 2-3 minutes until the mixture is smooth and almost foamy.
Combine: Whisk in the chocolate and butter mixture then fold in the flour, cocoa powder and salt. (Stop mixing when there are no pockets of flour left, don’t over mix.)
Oreos in: Gently stir most of the Oreos into the batter.
Into the tin: Spoon into the lined tin and spread out. Scatter over the rest of the Oreos (this makes sure you get lots of Oreo in each bite.)
Bake: Bake for 30-35 minutes. You need to keep an eye on your brownies towards the end of the baking time. They should have set edges and top but a skewer will come out of the middle with a few crumbs on it - not completely clean.
Cool: Leave to cool completely in the tin before slicing.
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