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Export 4 ingredients for grocery delivery
Step 1
Preheat oven to 350 degrees F (175 degrees C).
Step 2
Combine oats, brown sugar, and 1/2 cup flour in a bowl. Cut butter into oat mixture using a pastry blender until mixture is moistened and crumbly.
Step 3
Spread blackberries into an 8-inch square baking dish and mix in the remaining 1/4 cup flour until berries are coated. Sprinkle crumb topping over berries.
Step 4
Bake in the preheated oven until golden brown, 35 to 40 minutes.