Place the frozen berries, cornflour and honey into an 8 inch by 10 inch baking dish. Toss to evenly coat the cornflour and pop in the oven for 10 minutes.
Meanwhile, add the butter cubes and flour into a bowl and rub your hands together until you achieve a rough breadcrumb like texture. Then add the sugar and stir with your hands.
After 10 minutes of cook time, top the blueberries with the crumble mix. Bake for 30 minutes. Serve with a scoop of ice cream and enjoy.