Packed with a mix of summer berries and piled high with buttery streusel, this mixed berry streusel crumble is a quintessential easy dessert for summer!
Make the filling: In a large saucepan over medium-high heat, bring berries, sugar, and lemon juice to a low simmer. Remove 1/2 cup liquid and whisk with cornstarch until smooth. Add cornstarch mixture to saucepan and stir berries occasionally until bubbly and thickened. Remove from heat and pour into the bottom of a 9x13 baking pan.
In a separate medium bowl, combine all topping ingredients until crumbly. Sprinkle evenly over fruit filling.
Bake pie at 350F 30 minutes or until topping is golden and filling is bubbly. Serve crumble warm and enjoy!