Dimply Plum Cake

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Ingredients

1 1/2 cups all-purpose flour
2 teaspoons baking powder
1/4 teaspoon salt
scant 1/4 teaspoon ground cinnamon
5 tablespoons unsalted butter, at room temperature
3/4 cup (packed) light brown sugar
2 large eggs
1/3 cup flavorless oil, such as canola or safflower
grated zest of 1 orange
1 1/2 teaspoons pure vanilla extract
8 purple or red plums (or even italian prune plums, when they are in season), halved and pitted