Follow the steps in order for the best result.
Begin by preheating your oven to 400 degrees Fahrenheit (200 degrees Celsius). This will ensure your pie bakes evenly.
Carefully line a 9-inch pie pan with your prepared pie pastry. Make sure the pastry fits snugly against the bottom and sides of the pan.
In a mixing bowl, combine 1 cup of sugar, 5 tablespoons of flour, and 1/2 teaspoon of cinnamon. Mix these dry ingredients thoroughly to ensure they are well combined.
Gently fold the fresh peach slices into the sugar mixture, ensuring they are lightly coated. Be careful not to mash the peaches.
Pour the peach mixture into the prepared pie shell, distributing it evenly.
Dot the top of the peach filling with 1 1/2 tablespoons of butter, distributing small pieces across the surface.
Cover the pie with a top crust. Crimp the edges to seal the top and bottom crusts together.
Use a fork to prick the top crust several times. This allows steam to escape during baking, preventing the crust from becoming soggy.
Sprinkle the top crust with a bit of extra sugar for a sweet and golden finish.
Place the pie in the preheated 400-degree oven and bake for 40 to 50 minutes, or until the crust is golden brown and the filling is bubbly. If the crust starts to brown too quickly, you can cover the edges with foil.
Remove from oven and let cool completely before serving.