1 C. rolled oats
1 C. brown sugar
1 tsp. cinnamon
3/4 C. flour, divided
1/2 C. butter
4-5 C. fresh blackberries and peaches
Preheat oven to 350.
Combine oats, brown sugar, cinnamon and 1/2 cup flour in a bowl. Cut butter into oat mixture using a pastry blender until mixture is moistened and crumbly.
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.
Bake in the preheated oven until golden brown, 35 to 40 minutes.