Ingredients

• 1 cup rolled oats
• 1 cup brown sugar
• 3/4 cup all-purpose flour, divided
• 1/2 cup butter, softened
• 4 cups fresh blackberries

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Instructions

1. Preheat oven to 350 degrees F (175 degrees C).
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.
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.
4. Bake in the preheated oven until golden brown, 35 to 40 minutes.