Preheat the oven to 180°C/350°F/Gas mark 4. Brush a 23cm/9in glass or ceramic pie plate with melted butter.
Spread the cherries on the bottom of the pie plate in a single layer.
Sift the flour into a bowl, add the sugar and make a well in the centre. Gradually add the combined eggs, milk and butter, whisking until smooth and free of lumps.
Pour the batter over the cherries, and bake for 30–35 minutes. Remove from the oven and dust generously with icing sugar. Serve immediately.