01 -
Peel and slice the peaches. For easy peeling, blanch them in boiling water for 30 seconds and then transfer to an ice bath.
02 -
In a medium saucepan, combine sliced peaches, granulated sugar, brown sugar, lemon juice, and cinnamon (if using).
03 -
Heat over medium heat until the peaches begin to release their juices. Stir in cornstarch and continue to cook, stirring frequently, for 5–7 minutes until the mixture thickens.
04 -
Stir in the butter until fully melted and the mixture is smooth. Remove from heat.
05 -
Let the filling cool completely before using in a pie shell or storing in the fridge or freezer for later use.