In a large bowl, whisk together the icing sugar, almond powder, and flour.
Add the eggs to the dry ingredients and whisk until the batter is smooth.
Split the vanilla bean in half, scrape out the seeds with a knife, and whisk them into the batter.
Pour in the liquid cream and whisk well to fully combine.
Grease a 26 cm baking dish with butter.
Pit the mirabelle plums and arrange the halves evenly in the bottom of the greased baking dish.
Pour the batter over the mirabelle plums.
Bake in a preheated oven at 165°C for 1 hour until golden brown and set.
Cook it hands-free.
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