Heat oven to 160°C Fan oven. Line a 20cm square tin with baking paper.
Beat the butter and sugars together until pale and creamy. Stir in the baking powder, flour and gradually add the oats.
Chocolate Filling
Melt the butter, sugar, milk chocolate, and 80g of the dark chocolate gentky in a pan. Remove from heat, then add the cocoa, flour and baking powder and mix well.
Layer up
Add half the oat mixture to the tin and press down with hands until all corners are covered.
Now add the chocolate mixture ontop and spread evenly.
Take some baking paper and roll out the other half of the oat mixture and place on top. Make sure all corners are covered.
Place on the middle shelf in the oven for 40 minutes until golfer brown. Leave to cool completely before drizzlinh the remainder melted dark chocolate.
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