Step 1: Preheat oven to 180°C and then grease a 5cm-deep, 20cm x 30cm (base) roasting dish or slab pan and then line base and sides with baking paper, allowing a 2cm overhang at both long ends.
Step 2: Using an electric mixer, beat melted butter, eggs, flour, caster sugar, sour cream, custard powder and vanilla essence for 3 minutes or until pale and fluffy.
Step 3: Pour half the mixture into prepared dish or pan and then spread apple over mixture and then top with remaining mixture.
Step 4: Make crumble topping:- combine flour, white sugar, baking powder and cinnamon in a bowl and using your fingertips, rub butter into flour mixture until mixture resembles coarse breadcrumbs and then sprinkle topping over cake mixture.
Step 5: Bake cake for 1 hour to 1 hour 15 minutes or until a skewer inserted into the centre comes out clean.
Step 6: Serve warm with cream.
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