Make the door, windows and ghost
For the door: Cut a Matchmaker to 7.5cm long, then place 3 more either side of it. Cut these at a downward angle, on both sides, to create an arched door, then press onto the brownie.
For the windows: Roll out the yellow icing to 2mm thick and cut into pieces just larger than your biscuits. Dab a little water on the icing, then carefully press onto the biscuits. Fold over the edges and press onto the back of the biscuits to seal. Roll out the white icing to 2mm thick and cut out a small ghost, 3 x 6cm. Moisten and stick onto one of the windows. Roll out half the black icing to 3mm thick and cut into 2mm strips to make windowpane details. Dab with water, stick to the yellow icing, then stick the windows onto the house.
For the ghost: Halve the remaining black icing. Roll one half into an egg shape for the spider’s body and roll the rest into a thin sausage shape. Cut the length equally into 4, then lay parallel and gently squeeze in the middle to make legs. Dab the centre with water and press the body on top. Dab water onto a window and stick on the spider. Use the icing offcuts to make a door handle and eyes for the ghost.