Preheat oven to 180°C. Line 20 cm pan with baking paper.
Melt the butter and chocolate together in the microwave in short bursts on medium.
In a bowl beat the eggs with the sugar and vanilla.
Sift the flour into another bowl and add the salt.
Let the chocolate mixture cool a bit before beating in the egg and sugar mixture.
Slice the Cadbury Creme Eggs in half lengthways (I found a serrated knife was the best tool for this job) and arrange them on the top of your brownies. Only slightly press them into the brownie batter as they will sink whilst baking
Pour into lined tin and bake for 30 minutes.
When it’s ready the top should be dried to a pale brown but the middle still dark and slightly gooey.
Once the brownies are cooled, slice into 9 squares.