Whipped cream or vanilla ice creamfor serving, optional
Instructions
Preheat your oven to 350°F.
In a bowl, combine the rolled oats, brown sugar, vanilla, and 1/2 cup of the all-purpose flour. Cut in the softened butter using a fork or pastry blender until the mixture becomes crumbly.
In another bowl, toss the fresh blackberries with the granulated sugar, cinnamon, and remaining 1/4 cup all-purpose flour until well coated.
Spread the coated blackberries evenly in an 8x8-inch baking dish. Sprinkle the oat topping evenly over the fruit.
Bake for 35 to 40 minutes until the topping is golden and the fruit is bubbly. Let cool slightly before serving, approximately 10 minutes. Serve with whipped cream or vanilla ice cream, if desired.