1tablespoonextra-virgin olive oil or melted butter
1tablespoonfresh lemon juice
Instructions
Preheat oven to 350° F. Spray or grease a 6-inch cast iron skillet and set aside.
Heat a small saucepan over medium-high heat. Add blackberries, sugar and lemon juice and stir to combine. Bring to a boil, reduce heat to medium, add cornstarch and simmer until blackberries just start to breakdown, about 3-4 minutes.
Transfer blackberries to prepared skillet and set aside while you prepare the crumble topping.
Crumble Topping
In a small bowl, combine flour, oats, sugar, salt, cinnamon, oil and lemon juice. Mix together with a fork until all ingredients are moistened and small clumps start to form. Pour crumble toping over blackberries and spread out into an even layer, leaving some edges exposed.
Bake crumble for 20-25 minutes until crust is a light golden brown. Allow to cool for 5 minutes and top with a scoop of vanilla ice cream or Greek yogurt if desired. Enjoy!