Add topping ingredients into a medium-sized mixing bowl.
Use a pastry blender and thoroughly combine.
Pour the topping over the top of the cobbler and spread to cover.
Bake for 45 minutes (or until the crumble topping is golden brown and peach filling is bubbling. (For ramekin single servings, check after 30 minutes)
Remove from the oven and let sit for 1 hour before serving. (serving immediately is optional but it will be runny)