01 -
Preheat oven to 375°F and grease a 10-inch cast-iron skillet or 9x9-inch baking dish.
02 -
In the skillet, combine berries, granulated sugar, flour, cornstarch, and salt. Mix well and spread evenly.
03 -
In a large bowl, mix flour, oats, brown sugar, salt, cinnamon, and melted butter until mixture is sandy with lumps.
04 -
Evenly spread crumble over the berry mixture and gently press down.
05 -
Bake for 35–40 minutes until topping is golden and filling is bubbling. Let rest 10 minutes before serving.