Prep time 10 minutes
Cook time 60 minutes
Preheat oven to 375ºF.
Make the berry filling: Gently combine all ingredients in a large bowl (don't worry the cornstarch will absorb) and set aside.
Make the crumb topping: Combine all ingredients in a food processor and pulse until crumbly.
Spoon the berry mixture into your pre-baked pie shell and cover edges of pie crust with foil or a pie shield to prevent the crust from burning.
Top with crumb topping. Place on a parchment/foil lined baking sheet and bake for approximately 45-60 minutes or until topping is golden brown.