In a large bowl combine flour, brown sugar, 1/4 cup sugar, cinnamon, salt and oats. Using a pastry blender, a fork or your hands cut in butter. Keep cold until ready to use.
In a large bowl combine berries, 1/2 cup sugar, and cornstarch; toss to coat. Evenly divide the fruit mixture between the 6 ramekins. Top with crumble topping. Bake until top is golden and fruit is bubbly, about 35 minutes. Serve warm.