- In a mixing bowl, combine brown sugar, granulated sugar, apples, salt, and cinnamon. Spread onto bottom of slow cooker.
- Mix your crumble topping ingredients until it comes together. Sprinkle it over top of the apples. Cook on low for 4 hours, or high for 2 hours.
- Turn off heat and let sit, covered, for one hour to let the caramel thicken.