These warm, pudding-like individual desserts are the perfect use for those last-of-the-season plums. If you'd like, sift some powdered sugar over the clafoutis before serving.
Preheat oven to 375°F. Brush six 5-inch diameter, 1-inch-high ovenproof dishes with 1 tablespoon melted butter; place dishes on rimmed baking sheet. Cook diced plums, 4 tablespoons sugar, and 2 tablespoons brandy in medium skillet over medium-high heat until juices bubble thickly, stirring often, about 5 minutes. Cover; cook until plums are just tender, stirring occasionally, 2 to 3 minutes.
Using slotted spoon, divide diced plums among prepared dishes. Add orange juice concentrate to juices in skillet; stir to blend. Pour into 1-cup measuring cup. Add remaining 2 tablespoons brandy, then enough cream to measure 3/4 cup total.
Whisk 1/2 cup plus 2 tablespoons sugar and flour in large bowl. Whisk in cream mixture, eggs, and remaining 3 tablespoons melted butter. Spoon batter over plums in dishes. Top with plum slices; sprinkle with remaining 1 tablespoon sugar.
Bake clafoutis until puffed and crusty and center is just set, about 30 minutes. Cool 15 minutes and serve warm.
