Ingredients:

  • 6 large (approx. 3 lbs / 1.36kg) Granny Smith or Honeycrisp apples, peeled and sliced
  • ½ cup (100g) granulated sugar
  • 1 tbsp (8g) cornstarch
  • 1 tsp (2g) ground cinnamon
  • 1 tbsp (15ml) fresh lemon juice
  • 1 tsp (5ml) vanilla extract
  • 1 cup (90g) old-fashioned rolled oats
  • 1 cup (125g) all-purpose flour
  • 1 cup (200g) packed light brown sugar
  • ½ tsp (3g) salt
  • ¾ cup (170g) unsalted butter, chilled and cubed

Instructions:

  1. Preheat your oven to 375°F (190°C) and lightly grease your 9x9 inch baking dish.
  2. In a large bowl, toss the sliced apples with lemon juice and vanilla extract to prevent browning.
  3. Sprinkle in the granulated sugar, cornstarch, and cinnamon. Toss until every apple slice is evenly coated in the spice mixture.
  4. Transfer the mixture to the baking dish, spreading the apples evenly to ensure consistent cooking.
  5. In a separate bowl, whisk together the oats, flour, brown sugar, and salt.
  6. Add the chilled, cubed butter. Use a pastry cutter or your fingertips to work the butter into the dry ingredients until the mixture resembles coarse crumbs with some pea-sized lumps of butter remaining.
  7. Scatter the topping evenly over the apples without pressing it down.
  8. Bake for 40–50 minutes until the topping is a deep mahogany-gold and the apple juices bubble thickly around the edges.
  9. Remove from the oven and let it rest for 10 minutes to allow the filling to set.