In a bowl, combine all of the filling ingredients, folding gently with a spatula to combine.
6-8 Peaches, 2 Tablespoons Unsalted Butter, 1 teaspoon Cinnamon, 1/4 Cup Brown Sugar, 2 Tablespoons Cornstarch
Place fruit mixture in bottom of a greased dutch oven or 9x13-inch pan.
In a separate bowl, add the oats, brown sugar, flour, cinnamon and salt. Stir to combine.
1 Cup Old-Fashioned Oats, 3/4 Cup Brown Sugar, 1 Cup All-Purpose Flour, 1/2 teaspoon Cinnamon, 1 Pinch Salt
Add the butter and using a fork or pastry cutter, cut in the butter. At the end, use your hands to combine everything into a thick paste.
3/4 Cup Butter
Spread topping mixture over fruit.
Bake for 30-40 minutes or until done. Let cool for about 10-15 minutes and serve with ice cream!
Notes
To peel peaches, start with perfectly ripe peaches. If they are under ripe at all, the only way to peel them is by poaching them in hot water and cooling in cold water. Then use a paring knife to peel the skin off of the fruit. If the fruit is ripe, gently peel the skin off of the fruit with a paring knife by starting to cut and then as the skin loosens, grab it with your thumb against the knife and gently peel.
The top should be crisp like a cookie when it is done. If it is still soft. you need to keep baking.