Regular size
Topping:
3/4 cup flour
1/2 cup sugar
1/4 cup brown sugar
pinch of salt
1/2 cup oats
1 stick cold butter cut into chunks
Cut the butter into the rest of the ingredients with a pastry cutter or 2 knives. Then use your fingers to rub the butter into the dry ingredients. Set aside.
1 purchased pie crust
Line a pie plate or oblong baker with crust.
This 3 lb bag is from Sam's. If using a deep dish pie plate, you will need all but 2 cups.
Filling:
1 bag frozen triple berries 2 1/2 to 3 lbs (blueberries, raspberries and blackberries)
They have this at Trader Joes or you can make your own mixture with a bag of each. Or you can use all blackberries or Marion berries (which are just big blackberries)
1/3 cup flour
1 1/4 cup sugar
Mix together flour and sugar in a large bowl. Add berries. They can be fresh or frozen but will require additional baking time if frozen. Toss to coat. Pour into crust. Dot berries with 2 Tbsp. butter. Top with crumb topping.
Bake at 350 for 60 minutes if berries were thawed. 75 to 90 minutes if they were frozen.
