01 -
Preheat oven to 375°F (190°C). Lightly spray an 8 or 9-inch baking dish with nonstick cooking spray and set aside.
02 -
In a medium bowl, whisk together flour, brown sugar, baking powder, salt, and cinnamon. Pour in melted unsalted butter and mix with a fork until coarse crumbs form.
03 -
In a large bowl, combine chopped Granny Smith apples, granulated sugar, lemon juice, cornstarch, salt, and cinnamon. Stir until apples are evenly coated.
04 -
Spread the apple filling in an even layer in the prepared baking dish. Distribute crumb topping evenly over apples, covering completely.
05 -
Place baking dish in preheated oven and bake for 35 to 45 minutes until topping is golden brown and apples are bubbling. Optionally, set a baking sheet underneath to catch any overflow.
06 -
Let the apple crumble cool for 15 minutes before serving to allow the filling to set. Serve warm, optionally with vanilla ice cream.