Apple Crumble with Cinnamon Oat Topping

1.Preheat your oven to 350°F (175°C).

2.In a large mixing bowl, combine the sliced apples, granulated sugar, lemon juice, 1 teaspoon ground cinnamon, and salt. Toss until the apples are well coated. Transfer the apple mixture to a greased 9-inch square baking dish, spreading it evenly.

3.In another bowl, mix together the rolled oats, all-purpose flour, brown sugar, baking powder, and 1/2 teaspoon ground cinnamon. Stir in the melted butter until the mixture is crumbly. If using, fold in the chopped walnuts for added crunch.

4.Sprinkle the oat topping evenly over the apples in the baking dish, ensuring it covers the apples completely.

5.Bake in the preheated oven for 30-35 minutes, or until the apples are tender and the topping is golden brown. The edges should be bubbling slightly, indicating the apples are cooked through.

6.Remove from the oven and let it cool for about 10 minutes before serving. This allows the juices to settle and makes it easier to serve.