Place your first cake on your board or plate and pipe the buttercream on top. Smooth the buttercream and then drizzle some chocolate ganache over the top.
Break your cookie dough into chunks (remember and leave some for the decoration) and place some on top of your buttercream and chocolate ganache.
Repeat this process until your cake is completely stacked. Don’t worry if your buttercream splodges out of the sides a little.
If some of your buttercreamhas splodged out the sides, using your cake smoother, smooth around the side of the cake.
Pipe the remaining buttercream around the side and top of the cake. It doesn’t need to be completely covered if there are some gaps this is okay because when you smooth it out it will cover the cake.
Smooth the buttercream on top first. If it spills over the side don’t worry.
Smooth around the sides of the cake. A lot of the buttercream will likely come off, just pop this into your bowl. If there are any bumps or gaps fill them in using the excess buttercream. Keep smoothing until the cake is completely smooth.
Cut your cookies in half and place them around the bottom of the cake. I used six cookies.
Using your chocolate ganache go around the edge of the cake and encourage it to drip.I do this by holding the piping bag or squeeze bottle ever so slightly awayfrom the cake. If you have any leftover ganache pour it onto the top of thecake and smooth.
Pop the cake into the fridge for half an hour to allow the ganache to set. If you don’t your buttercream will just slide off.
Put your left over buttercream into a piping bag and pipe swirls onto the top ofthe cake.
Roll the cookie dough into balls and place on top.
Decorate with chocolate chips.