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Rinse the mirabelle plums and use a cherry pitter. If you're using a large variety you can use a small knife to remove the pits. Coat the pie dish with butter and pre-heat the oven to 180 degrees Celsius or 350 degrees Fahrenheit.
Combine flour, baking powder and salt. Melt butter in a small saucepan and set aside. Combine 4 eggs, sugar and vanilla sugar in the bowl of your standmixer.
Mix for a few minutes and then gradually add the milk, flour, baking powder and a pinch of salt. Add melted butter and combine until you've reached a smooth batter.
Divide the batter over the pie dish. Divide the mirabelle plums on top and bake this lovely clafoutis for about 45 minutes, or until the batter is golden brown. A clafoutis tastes best when it's still warm, enjoy!