Preheat the oven to 350℉.
Drain the canned peaches and allow them to drain off while making the topping.
In a bowl, add in the flour, brown sugar, cinnamon, salt and the cold butter. Now, use a pastry cutter to mash create the crumbs for the topping with the butter. You can also use a potato masher but a pastry cutter is better.
Once everything is together, fold in the rolled oats.
Grab the draining peaches and add them into the baking dish. Sprinkle the cornstarch, sugar and cinnamon over them and mix into the peaches. Then, sprinkle the crumbled topping across the top.
Place the baking dish into the oven and bake for 45 minutes.
Remove from the oven and allow it to cool, super important for the crispy topping. Once cooled, serve with ice cream and enjoy.