Preheat the oven to 180oC and line a brownie pan with baking paper.
Prepare a double boiler. This can be done with a saucepan half-filled with water and a heatproof or metal bowl that fits on top of the saucepan - so that steam doesn't escape but the bottom of the bowl isn't touching the water when brought to a boil.
In your mixing bowl from the step above, combine the butter, sugar, cocoa & salt. Turn the boiling water down to a simmer and place the bowl on top, whisking to combine the ingredients as they melt together.
Continue whisking until all the ingredients are combined and hot - the batter will still be a bit grainy at this point which is fine.
Remove the bowl from the heat and set aside to cool slightly before whisking in the vanilla and eggs.
Once the eggs are well combined and the mixture is smooth and shiny, gently fold in the flour until fully incorporated. Spread the batter in your prepared pan and bake for 20-30 minutes.
Remove the browniefrom the pan, leaving the baking paper intact and allow to cool completely on a wire rack before moving on to the next steps.
In the bowl of an electric stand mixer, beat the butter until smooth and creamy.
Stop the mixer and add in the 2 cups of icing sugar and peppermint essence and a small amount of the milk. Gradually increase the speed of the mixer to incorporate the icing sugar into the butter.
Add the remaining milk as required to reach a thick, spreadable consistency. Taste the frosting and add more mint essence if desired.
Lift the cooled brownie up with it's baking paper edges and return to the pan. Spread the frosting over the cooled brownie, evening up the edges and providing a smooth base for the melted chocolate in the next step.
Break up or roughly chop the dark chocolate and butter and place in a microwave safe bowl.
Gently heat in 20second bursts, stirring in between until the ganache is a pourable consistency.
Pour over the brownie and tap gently on the counter to release any air bubbles that may be trapped in the ganache layer.
Cover and allow the brownie to set in the fridge overnight before removing from the tray and discarding the baking paper layer. Slice into small rectangles and serve.
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* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.