Preheat your oven to 400˚F and grease your baking dish of choice with butter or oil.
In a large bowl, thoroughly wash your peaches and slice them into little 1-2 inch cubes.
Add in your cinnamon, nutmeg, lemon juice and brown sugar and mix. Set aside.
In another large bowl, add in your oats, flour, brown sugar, vanilla extract and melted butter. Mixture together until well combined and crumbly.
Scoop your apples in an even layer in your baking dish(es) then add your crumble topping until the top is fully covered.
Bake in the oven for about 35-45 minute or until the tops are golden brown and hard.
Remove from oven and let cool for about 15 minutes.
Serve with a scoop of vanilla ice cream and/or whipped cream and enjoy!