Preheat oven to 350 degrees F.
Lay the 2 defrosted pie crusts on top of each other on a floured surface, flour and roll the crust to slightly larger than the 10 x 15 pan.
Carefully transfer pie crust to pan, and crimp edges of pan to hold in the filling.
Peel and cut peaches into slices, sprinkle with 2 tablespoons of cornstarch.
Mix together flour, melted butter, brown sugar, cinnamon, nutmeg and salt.
Fold oatmeal into flour mixture.
Add peaches to pie crust, be sure to evenly layer peach slices.
Sprinkle topping on top of peaches.
Bake for 30-45 minutes at 350 degree F.
Serve warm, top with whipped cream and fresh sliced peaches.