In a large mixing bowl, combine the plums, brown sugar, brandy, grated apple, cornstarch and cinnamon. Spoon the mixture into a 9" or 10" cast iron skillet or a lightly greased casserole dish.
In a medium mixing bowl combine the flour, baking powder, salt and granulated sugar. Add the butter and using a pastry blender, cut in the butter until the mixture resembles a coarse meal. Add the cream and stir with a fork just until moistened. Gently press the mixture together using a spatula, forming a loose dough. Crumble the dough on top of the plum mixture. Sprinkle with 1 tablespoon of coarse sugar.
Bake until the top is golden brown and the filling is bubbling, about 45 minutes. Serve warm topped with ice cream if desired.
Notes
We used Calvados Apple Brandy for this recipe.
Nutritional information is calculated using an ingredient database and should be considered as an estimate. When multiple ingredient alternatives are given, the first listed is calculated for nutrition. Garnishes and optional ingredients are not included.