This plum cake is made from a lightly spiced vanilla cake, topped with slices of fresh plums, topped with spiced walnut streusel and a dusting of powdered sugar.
Beat together the oil and butter together until smooth and well combined. Slowly stream in the lemon sugar into the oil butter mixture untill all the sugar is added. Beat until the mixture is light and fluffy, about 2-3 minutes.
Add eggs and vanilla extract, beating each one for about 20 seconds on medium speed before adding the next.Stir in the dry ingredients and buttermilk to the wet in alternating in order.