01 -
Preheat oven to 375°F.
02 -
In a large bowl, combine apples with granulated sugar, lemon juice, ground cinnamon, and ground nutmeg. Toss until apples are evenly coated.
03 -
Transfer the apple mixture into a greased 9x13-inch baking dish, spreading evenly across the bottom.
04 -
In a separate bowl, stir together all-purpose flour, packed brown sugar, and rolled oats. Add cold butter cubes and cut in with a pastry cutter or fork until the mixture resembles coarse crumbs.
05 -
Evenly sprinkle the crumbly topping over the apples in the baking dish, ensuring complete coverage.
06 -
Bake in the preheated oven for 30 to 35 minutes, or until the topping is golden and the filling is bubbling.
07 -
Allow to cool slightly, then serve warm, optionally topped with vanilla ice cream or whipped cream.