Preheat the oven to 180°C / 160°C fan / 350°F / gas 4. Line the bottom of a 5 inch tall baking tin and grease the sides.
Cream the butter and the sugar together (I like to use and electric mixer such as a Kitchen Aid). Beat the eggs together, adding them to the butter and sugar mixture a bit at a time and continue to whisk together.
Sieve the flour and cocoa powder into the bowl and fold into the mixture.
Add 1 tbsp of milk and mix.
Transfer to the baking tin, place into the oven and bake for 30-40 minutes (depending on your oven).
Milk chocolate frosting
Melt the chocolate in a bowl suspended over a pan of simmering water. Allow to cool slightly.
Whisk the butter to a cream.
Sieve in the icing sugar and whisk them together.
Then add the melted chocolate and mix it all together.
Assemble the cake
Take the cooled cake and carefully slice the domed top off of the cake to provide a flat surface. Slice the cake in half and place the bottom section onto a board, using a small dollop of frosting to secure it in place.
On top of the bottom half add a generous helping of the frosting and smooth down with the palette knife.
Place the top half on and proceed to spread the frosting all over the cake, covering it entirely.
Now add the chocolate fingers. Work your way round the cake, pressing them lightly into the frosting to hold them in place.
Lastly add the mini eggs. Working from the outside in, place the eggs in alternating colours so that you create rings.