Ingredients:

  • 6 cups (900g) fresh peaches, peeled and sliced
  • 1/2 cup (100g) granulated sugar
  • 2 tbsp (16g) cornstarch
  • 1 tsp (2g) ground cinnamon
  • 1 tbsp (15ml) lemon juice
  • 1/4 tsp (1.5g) salt
  • 1 cup (90g) old-fashioned rolled oats
  • 1 cup (125g) all-purpose flour
  • 1 cup (200g) packed light brown sugar
  • 1/2 tsp (2g) baking powder
  • 1/2 tsp (3g) salt
  • 1/2 cup (113g) unsalted butter, cold and cubed

Instructions:

  1. In a 9x9 inch baking dish or saucepan, toss the sliced peaches with granulated sugar, cornstarch, cinnamon, lemon juice, and salt.
  2. Let the peach mixture sit for 10 minutes to allow the fruit to release its juices and the cornstarch to dissolve.
  3. In a large bowl, whisk together the rolled oats, flour, brown sugar, baking powder, and salt.
  4. Add the cold, cubed butter to the dry ingredients. Use a pastry cutter or forks to work the butter in until the mixture looks like coarse wet sand with some pea-sized lumps remaining.
  5. Spread the oatmeal topping evenly over the peaches without pressing down firmly.
  6. Bake in a preheated oven at 375°F (190°C) for 40–45 minutes until the fruit juices are bubbling and the topping is deep golden-brown.