Ingredients:

  • 6 large (approx. 3 lbs / 1.36kg) Granny Smith apples, peeled, cored, and sliced
  • 1/2 cup (100g) granulated sugar
  • 1 tbsp (8g) cornstarch
  • 1 tsp (2g) ground cinnamon
  • 1/4 tsp (1g) ground ginger
  • 1 tbsp (15ml) lemon juice
  • 1 cup (90g) old-fashioned rolled oats
  • 3/4 cup (95g) all-purpose flour
  • 3/4 cup (150g) packed light brown sugar
  • 1/2 tsp (3g) salt
  • 1/2 cup (113g) unsalted butter, chilled and cubed
  • 1/2 cup (60g) chopped walnuts or pecans

Instructions:

  1. Lightly grease the interior of your slow cooker with cooking spray to prevent the edges from sticking.
  2. In a large bowl, whisk together the sugar, cornstarch, cinnamon, and ginger. Add the sliced apples and lemon juice, tossing until every slice is evenly coated.
  3. Transfer the apple mixture into the slow cooker, spreading them evenly.
  4. In a separate bowl, combine the oats, flour, brown sugar, and salt.
  5. Add the chilled butter cubes and use a fork or your fingers to rub the butter into the dry mix until coarse, pea-sized crumbs form. Stir in nuts if using.
  6. Sprinkle the topping evenly over the apples without pressing down.
  7. Place a thin cotton kitchen towel over the top of the apples, then place the lid firmly on top of the towel to absorb condensation.
  8. Set the slow cooker to Low for 3 hours or High for 1.5 hours.
  9. Remove the lid and towel. Continue cooking uncovered for an additional 30 minutes to allow the topping to set and the juices to thicken.