Preheat the oven to 350 degrees F (180 degrees C).
In a bowl add Butter (200 gram) and Caster Sugar (1 cup). Mix with a whisk until it becomes nice and creamy.
Add in Egg (2) then mix to incorporate them. Add in Milk (1 cup), Sunkist Orange (1), Vanilla Extract (1 1/2 teaspoon). Mix that through. Add Self-Rising Flour (2 cup), Ground Cinnamon (1 tablespoon) and Apple (3). Using a spoon, mix until well combined.
Pour into a round springform cake tin lined with baking paper. Place into the preheated oven for 35-40 minutes.
Remove, dust with Powdered Confectioners Sugar (to taste), then slice and serve.