01 -
Preheat the oven to 400°F (200°C). Butter a 23×23 cm (9×9 inch) baking pan and set aside.
02 -
In a large bowl, combine the peaches, granulated sugar, 2 tablespoons flour, cornstarch, 1 teaspoon cinnamon, and salt. Mix until well combined. Transfer the peach mixture to the prepared baking pan.
03 -
In the same large bowl, cream together the brown sugar, remaining ½ cup flour, butter, and remaining teaspoon of cinnamon until it forms a wet, clumpy mixture. Add the oats and mix until a coarse crumble forms. Using hands provides the best texture.
04 -
Evenly distribute the oat mixture over the peaches. Bake for 20 to 25 minutes, until the topping begins to turn golden around the edges. Remove from the oven and allow to rest for 10 minutes before serving.
05 -
Serve warm, with a scoop of vanilla ice cream if desired.