Lightly grease a 10-inch, 8 x 10 or 11 x 7 inch baking dish. Preheat the oven to 350 F (177 C).
In a large bowl whisk the flour, oats, light brown sugar, ground cinnamon and salt together until well combined. Work about ¼ of the melted butter at a time into the dry ingredients until all the butter is mixed in. Transfer the crumble to the fridge until it’s time to top the cherry filling.
1 cup (90 g) old fashioned oats, ¾ cup (90 g) all purpose flour, ½ cup (100 g) light brown sugar, ¼ cup (50 g) granulated sugar, 1 teaspoon ground cinnamon , ¼ teaspoon salt , 8 tablespoons (113 g) unsalted butter, melted
In a large bowl toss the fresh or frozen cherries with the light brown sugar, cornstarch, lemon juice, vanilla extract and salt. Make sure all the fruit is well coated. Transfer the fruit mixture to the prepared baking dish. Top the crisp with the brown sugar oat topping.
6 cups fresh or frozen cherries , ½ cup (100 g) light brown sugar, 4 tablespoons cornstarch, 2 tablespoons (10 ml) lemon juice, 2 teaspoons (10 ml) vanilla extract , ¼ teaspoon salt
Bake the cherry fruit crisp for 45 - 60 minutes or until the top is a beautiful golden brown and the cherry filling is bubbling around the edges of the baking dish.
Cool the cherry dessert for 20 - 30 minutes. The filling needs time to cool and thicken. After the crumble has cooled, scoop into a bowl, top with ice cream or whipped cream and enjoy.