Preheat the oven to 165 degrees C. Grease a 25cm flan tin or a similar sized baking dish.
Spread out the cherries in the bottom of the prepared flan tin and set aside.
In a small bowl whisk together the flour, salt and sugar. In a medium bowl whisk together the egg whites, milk and cream. Stir in the kirsch and vanilla bean. Gradually whisk in the flour mixture until smooth. Remove the vanilla bean from the batter and pour it over the cherries.
Bake for 45 minutes in the preheated oven or until puffed and browned. Let cool until the top sinks in slightly. Dust with icing sugar before serving.