Step 1

Preheat oven to 350°F. Grease a 9 1/2 inch deep dish pie plate or similar sized baking dish. Set aside.

Step 2

In a large bowl, combine oats, flour, sugars, salt, and cinnamon. Add melted butter and stir until well combined. Transfer to the freezer for a few minutes while you assemble the fruit filling.

Step 3

In a large bowl, combine all filling ingredients. Stir gently until well combined. Dump into prepared baking dish.

Step 4

Sprinkle the topping over the berries (pressing some of it together with your fingers to form clumps). Bake for 40-50 minutes until the fruit is bubbling and juicy and the topping is light golden brown. Cool slightly, serve warm with vanilla ice cream.