Preheat the oven to 160 ºC and line a 20cm square tin with baking paper and grease
Melt 185g unsalted butter and 185g of good quality dark chocolate together
Whisk 3 large eggs and 275g caster sugar together until the volume doubles
Gently add the chocolate and butter mixture to the whisked eggs and sugar and stir gently
Sift in 40g of cocoa and 85g of plain flour, fold this into the brownie batter
Add the mixture to the lined and greased tin, and bake in the oven for 15minutes.
Remove from the oven and add 6 Creme Egg halves, gently press them into the brownies evenly spaced out.
Return to the oven for another 5-10mins
Leave to cool before removing from the tin and slicing