Preheat the oven to 350°F (175°C).

In a mixing bowl, combine sliced peaches, granulated sugar, lemon juice, and cinnamon. Toss gently to coat the peaches evenly.

Transfer the peach mixture to a greased baking dish.

In another bowl, mix together flour, brown sugar, rolled oats, and salt.

Pour in the melted butter and stir until the mixture resembles coarse crumbs.

Sprinkle the topping evenly over the peach filling in the baking dish.

Bake in the preheated oven for 30 minutes or until the topping is golden brown and the peaches are bubbly.

Remove from the oven and let cool for a few minutes before serving.