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Brush the muffin tin with oil. Ask your grown-up helper to switch the oven to 190C/ 170C fan/gas 5.
Grate the courgettes and put them in a large bowl. Grate the apple and add to the bowl. Squeeze the orange and add the juice to the bowl.
Break the egg into a bowl; if any bits of shell get in, scoop them out with a spoon. Stir the butter and egg into the courgette and apple mix.
Sieve the flour, baking powder and cinnamon into the bowl. Add the sugar and sultanas.
Mix with a spoon until everything is combined, but don’t worry if it is lumpy.
Spoon the mixture into the tin. Ask your helper to put it in the oven and cook for 20-25 mins. Cool in the tin, then spread some icing on each.
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