Step 1

Preheat oven to 375 degrees. Butter a 9 by 9-inch or 11 by 7-inch baking dish.

Step 2

For the crumble: In a mixing bowl whisk together flour, oats, brown sugar, granulated sugar, cinnamon and salt.

Step 3

Add butter and cut into mixture using a pastry cutter or fork (or rub with fingertips), until mixture resembles coarse crumbs. Transfer to refrigerator.

Step 4

For the filling: Rinse berries and let drain (but don't dry). Transfer to baking dish.

Step 5

In a small bowl whisk together sugar and cornstarch. Pour cornstarch mixture evenly over berries then toss to evenly coat.

Step 6

Remove crumble from refrigerator and sprinkle evenly over berries.

Step 7

Bake in preheated oven until filling is bubbling and topping is golden brown and crisp, about 30 - 35 minutes. Serve warm with vanilla ice cream.

Step 8

Recipe source: Cooking Classy