For topping, in a medium bowl, combine the 1 cup flour, the brown sugar, and cinnamon. Using a pastry blender, cut in the 1/2 cup butter until crumbly. Sprinkle over filling. Bake in a 375 degree F oven about 35 minutes or until pastry is golden. Cool slightly on a wire rack. Serve warm. Dollop with whipped cream and garnish each with a berry and mint, if you like. Makes 6 servings.