Preheat oven to 400°F and spray a 2 quart baking dish with non stick spray and set aside.
In a large mixing bowl, mix together the berries, flour, brown sugar, cinnamon, vanilla, and salt. Add mixture to the prepared baking dish and set aside.
7 cups berries, 1/4 cup light brown sugar, 1 teaspoon cinnamon, 1 teaspoon vanilla extract, ½ teaspoon kosher salt, 1/4 cup gluten-free flour
Whisk together the gluten-free flour, brown sugar, and cinnamon. Use a pastry blender or fork to cut the cold butter into the mixture until it becomes crumbly. Stir in the gluten-free oats. Cover the berry mixture with the oat topping.
3/4 cup gluten-free flour, 1 cup old fashioned rolled oats, 3/4 cup light brown sugar, 1 teaspoon cinnamon, 1/2 cup unsalted butter
Bake in the pre-heated oven for 40-45 minutes or until the crumble topping is golden brown and the edges are bubbling. Begin checking the crisp at 35 minutes and cover with foil if needed to avoid over-browning. Allow to cool slightly and serve warm with whipped cream or ice cream.