This is a fantastic and easy cake, with a beautifully moist and dense crumb, with a caramel tone from the brown sugar. A layer of sweet juicy plums is on top that softens just enough to make it irresistible. You can make it with oil or half butter. It comes together quickly.
Working a hand mixer (or stand mixer) in a large bowl, beat 2 eggs adding ¼ cup white sugar and ½ cup packed brown sugar gradually and beating for another 2 minutes, until thick and lighter in color.
Add ½ cup sunflower oil in a thin stream, beating for a minute or two, until it thickens.
Add 1 teaspoon orange zest and 1 ½ teaspoons pure vanilla extract and mix well.
Reduce the mixer speed to low speed and add the sifted dry ingredients (flour, salt, and baking powder) in 2 parts, mixing only until they are incorporated. You can sift them directly over the oil batter or sift them in a different bowl and then add.
Run a spatula around the bowl and under the batter, just to make sure there are no dry spots, then scrape the batter into the pan and smooth the top.
Arrange 7 or 8 red plums cut in wedges in a circle, or however you want. Sprinkle 1 tablespoon brown sugar on top.
Bake for about 45 minutes, or until top is brown and puffed around the plums that are juicy and wrinkled, and a tester inserted into the center comes out clean. Ovens are all different so it might take a little more or a little less time to fully bake.
Transfer to a wire rack and cool, then run a knife around the sides of the pan and remove the cake.
Serve at room temperature, plain with a sprinkle of powdered sugar.
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Notes
Oil and butter: you can use both instead of only oil. Use ¼ cup of oil and ¼ cup of butter, at room temperature. Beat soft butter with sugar for 2 minutes, add eggs, one at a time, and then oil in a stream, beating until you have a thick, satiny batter. Follow from step 5 in the recipe above. Loaf pan: You can use a large loaf pan, and the cake will be taller with less fruit on top.Flavorings: Plums pair well with cinnamon, cardamom, and almond, so you can add a large pinch of one of the spices and some pure almond extract. Also, tangerine zest if you don't have oranges. Or, you can use no orange zest and more spice.Storing: This cake keeps well for several days in the fridge, well wrapped, and can be frozen for up to a month. Keep in mind that frozen fruit never comes back to its original state, but it still works.Fruit: Plums work very well with this sweet cake batter because they have a good acid level, but it's a great recipe to use with other stone fruits, such as peaches, nectarines, apricots and even cherries.