Preheat oven 350 F. Butter a 9 inch pie pan and place the pie crust in the pan

Mix the sugar and corn starch together. Mix all of the other ingredients except the streusel topping ingredients together and then mix the sugar with the fruit mixture. Place the fruit mixture in the pie crust

Mix the streusel ingredients together, letting the ingredients clump together. Sprinkle the streusel on top of the fruit mixture

Bake for 1 hour. Let cool before cutting. Serve with whipped cream or vanilla ice cream. Store in the refrigerator