Preheat the oven to 170° C. Lightly grease 20cm round baking tin and line the bottom of it with baking paper.
Using a handheld electric whisk, cream the butter and sugar together, until pale and fluffy, about 2 minutes. Add vanilla and eggs, one at a time, mixing well after each addition. Add the black treacle and mix again to combine.
Sift in the flour, cocoa and all the spices, and add milk. Stir to combine until you have smooth batter.
Transfer the batter into prepared cake tin and smooth the top with small palette knife or the back of the spoon. Bake for 20 minutes, or until toothpick inserted in the middle comes out clean.
Remove from the oven and allow the cake to cool a little, before transferring it into wire rack to cool completely.
Place the cooled cake onto a board and slice it into 8 wedges. Push a chocolate finger through the base of each wedge.
Mix the icing sugar with few drops of green food colouring and add roughly about 2-3 tbsp of water. You want the icing to be not too runny, and still a bit stiff. Drizzle the icing over each cake pop and decorate each one with festive sprinkles. Enjoy!
The sponge can be frozen for up to three months. Wrap it in a double layer of clingfilm or reusable wrap, and place in the freezer. Thaw the cake in the fridge overnight.