Watch Chef John turn blackberries into a sweet blackberry crisp. It’s so simple! Combine fresh blackberries with sugar and lemon juice, and pour the sugared berries into a baking dish. Top them with an easy crumble made by combining flour, sugar, cinnamon, and rolled oats with butter. Cover the berries with the crumble and bake. That’s it! This recipe is ridiculously easy. It will come out of the oven crispy and chewy with just the right amount of sweetness. Serve with a big scoop of vanilla ice cream.