Mix all ingredients together for the peaches in a medium bowl. You will want to make sure you have at least 3/4" slices of peaches if you don't want them to cook down too much. Set aside while you make the crisp topping.
Mix all ingredients for the topping in a medium bowl. If you like a lot of topping, double the batch.
Lightly grease or prep with cooking spray a 9x13 casserole dish.
Add peach mixture into a single layer in the dish, using a slotted spoon to leave behind any juice. Then, add your crisp topping.