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Preheat oven to 180°C. Grease a 5cm-deep, 20cm x 30cm (base) roasting dish or slab pan. Line base and sides with baking paper, allowing a 2cm overhang at both long ends.
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.
Pour half the mixture into prepared dish or pan. Spread apple over mixture. Top with remaining mixture.
Make crumble topping- Combine flour, white sugar, baking powder and cinnamon in a bowl. Using your fingertips, rub butter into flour mixture until mixture resembles coarse breadcrumbs. Sprinkle topping over cake mixture.
Bake cake for 1 hour to 1 hour 15 minutes or until a skewer inserted into the centre comes out clean. Serve warm with cream.
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