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Pre-heat the oven to 190°C (375°F) and line a baking tray with grease-proof paper.
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Beat the butter, peanut butter and sugar in a bowl until nice and fluffy. Add the eggs and continue to beat until well combined.
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Combine the flour, vanilla sugar and baking powder and mix into the other ingredients. Take a huge spoonful of dough and flatten slightly in the palm of your hand. Push three Maltesers into the dough and then roll up into a ball so that the Maltesers are completely covered.
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Bake for around 20-25 minutes. After around 10 minutes, flatten the cookies slightly with a fork and continue to bake for the remainder of the time, until they are golden around the edges.
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Leave to cool on the tray for a while and then transfer to a wire rack. Enjoy!