01 -
Preheat oven to 175°C. Lightly grease a deep-dish pie plate or a large baking dish with butter or non-stick spray.
02 -
In a large mixing bowl, combine sliced apples, granulated sugar, ground cinnamon, and vanilla extract. Toss until the apple slices are uniformly coated. Transfer mixture to the prepared baking dish and spread into an even layer.
03 -
In a separate bowl, add flour, rolled oats, brown sugar, salt, and cinnamon. Pour in melted butter and stir mixture until a crumbly texture forms and ingredients are evenly moistened.
04 -
Distribute the prepared crumb topping evenly over the apple filling. Bake in the preheated oven for 45 to 60 minutes, or until the apple filling is tender and the topping is golden brown.
05 -
Allow to cool for at least 10 minutes before serving. Serve warm, optionally with a scoop of vanilla ice cream or whipped cream.