This is such an easy tart to make. Especially if you use nice ripe plums. If you add some yoghurt to xour dough , it will be moist.
Unsalted butter, for pan
1 cup flour
1 tsp. baking powder
1⁄2 tsp. kosher salt
1 cup sugar, plus 2 tbsp. for sprinkling
2 eggs, lightly beaten
1 cup plain yogurt
1⁄3 cup canola oil
1 tsp. vanilla extract
8 ripe plums, halved and pitted
1⁄4 tsp. ground cinnamon
Heat oven to 375°. F Grease tart baking dish with butter; set aside. Whisk flour, baking powder, and salt in a bowl.
In a separate bowl, whisk together 1 cup sugar and eggs until smooth. Stir in yogurt, oil, and vanilla. Add dry ingredients; whisk into a smooth batter.
Pour batter into greased pan and smooth top with a rubber spatula; arrange plum halves, cut sides down, evenly over batter. Combine remaining sugar with cinnamon in a small bowl; sprinkle over the top. Bake until plums are very tender and a toothpick inserted into middle of cake comes out clean, about 50 minutes. Let cool and slice into squares to serve.