This simple Homemade Berry Crumble is a perfect single-serving dessert featuring juicy blackberries topped with a crisp, buttery oat topping. The warm berries release their natural sweetness as they bake, creating a jammy filling that contrasts beautifully with the crunchy crumble. Ready in just 25 minutes with minimal ingredients, this comforting dessert is ideal for satisfying sweet cravings without making a full-sized dessert. Enjoy it warm from the oven, perhaps with a scoop of ice cream for an extra treat.