Preheat oven to 300°F (150°C). Line a baking sheet with foil.
In a large mixing bowl, stir together apples, cranberries, lemon juice and lemon zest. Add the white sugar and stir to coat.
In a medium bowl, stir together oats, flour, cinnamon and brown sugar. Stir in melted butter until mixture is thick and crumbly.
Spoon the cranberry apple mixture into six 4½-inch soufflé dishes. Top with oat topping.
Place the souffle dishes on the covered baking sheet. Bake for 45-55 minutes, until bubbly and the oat topping is golden brown. Let cool 10 minutes before serving.