Preheat oven to 350 degrees F
Butter square 8x8 baking pan
Peel and slice peaches, add to large bowl
Add lemon juice
Add sugar and toss to coat, set aside for 15 minutes
To make the topping - In a medium bowl, combine brown sugar, flour, oats, cinnamon and nutmeg until well combined
Mix butter into mixture until crumbly, set aside
Drain excess juice from peaches, add peaches back into bowl
Stir in flour, vanilla extract, salt and cinnamon
Add peaches to prepared baking pan
Evenly sprinkle crumb topping
Bake at 350 degrees F for 30-35 minutes or until golden brown
Serve warm or room temperature with vanilla ice cream, if desired