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Preheat oven to 350 degrees F.
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In the bowl of an electric mixer, blend together the flour, sugar, almonds and baking powder.
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Add the eggs, melted butter, oil, milk, vanilla extract and almond extract all at once.
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Blend on slow speed, just until the liquid ingredients are incorporated, and then on high speed for only about 20 seconds.
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Quickly spread the batter evenly over the prepared plums.
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Bake at 350 degrees F (325 for glass bakeware) for about 40-45 minutes or until a toothpick inserted in the centre comes out clean.
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Let rest in the pan for 10 minutes then invert onto a serving patter or wire rack to cool off.
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Serve with whipped cream or vanilla bean ice cream with toasted almonds as a garnish.