Preheat the oven to 350F. Roll out the pie crust and transfer to a 9-inch pie dish. Prick with a fork. Line the crust with foil, then weight down with pie weights or dried beans. Bake for 10 minutes. Remove the beans and the foil and cook the crust an additional 5 minutes. Remove from the oven and allow to cool.

Change the oven temperature to 375F.

In a bowl, combine the peaches, raspberries, sugar, cornstardh, lemon juice and cinnamon; mix gently. Pour into the pie crust. Bake for 35 minutes.

While the pie is baking, make the crumb topping. In another bowl, combine the flour, sugar and butter. Using a pastry cutter or a for, cut in the butter until it resembles coarse to fine crumbs. Sprinkle the pie with the crumb topping, then return to the oven to bake for an additional 12-15 minutes, or until golden brown. Cover the pie edges if needed to avoid over browning.

Let the pie cool completely before serving.