First, measure out a 170g use of butter on a scale and then melt that amount in a pan.
Whilst you wait for the butter to melt, measure out the White Caster and Light Brown sugars together. Then add them to your bowl and crack the three eggs to mix. Stir in your mixture using a tablespoon or hand blender machine until it is smooth.
Next, include 1 teaspoon of vanilla extract and melted butter in your bowl so you can continue to mix until the mixture is thick and glossy like below.
Finally, add the rest of the ingredients from the above list, which includes 50g of flour and 110g of cocoa powder. You can add a pinch of salt if you may, but not necessarily.
Once you have continuously mixed your main ingredients. Now it is time to pour some parts of the chocolate mixture into a wide pan, ensuring all corners are covered with your melted chocolate spread.
You then add your chocolate pieces on top, in my instant, I used 12 pieces of After 8 Mint chocolate.
Finally, pour the rest of your melted spread on top of those After 8 mint pieces until all the mint pieces are covered with the melted chocolate.
Once that's completed, pop it into your oven between 150C and 180C for about 30-40 minutes until they are ready to take out and depending on how well cooked you want it.