1.Preheat oven to 180°C (160°C fan) and butter a 32x22x5cm baking tray.
2.Combine flour, custard powder, sugar, milk, eggs, vanilla and salt in a bowl. Pour melted butter over top and beat well for 3 minutes. Pour mixture into prepared baking tray and bake 45 minutes or until a skewer comes out clean. Cool on a wire rack in tray.
3.To make icing: Combine icing sugar with enough water to make a spreadable consistency. Use a spoon or spatula to spread icing over to of cake. Decorate with lollies. To serve, cut into squares.
Makes 20 squares.
Note
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