Preheat your oven to 350°F (175°C).

Wash the fresh peaches thoroughly, peel if desired, slice into thin wedges, and arrange in a baking dish.

In a mixing bowl, combine rolled oats, flour, granulated sugar, brown sugar, ground cinnamon, and a pinch of salt. Mix until even.

Cut cold unsalted butter into small pieces and add to the dry mixture. Cut in until it resembles coarse crumbs.

Distribute the crumble topping evenly over the sliced peaches.

Bake for 30 to 35 minutes until golden brown and the filling is bubbly.

Let it rest for at least 10 minutes before serving.