Combine peaches in a bowl. In a separate bowl mix together the sugar, brown sugar, corn starch, and cinnamon. Then combine with the peaches and stir together.
Spoon filling into a prepared 9-inch pie crust or place in a covered container to store for later. It will stay fresh for 3 to 5 days in the refrigerator and up to 3 months in the freezer.
Notes
Use fresh, ripe peaches for the best flavor. Can also be used as a topping for yogurt or ice cream.