1 cup rolled oats
1/4 cup brown sugar
1 teaspoon ground cinnamon
1. Preheat oven to 350 degrees F (175 degrees C).
2. Core each apple making a large well in the center and arrange apples on a rimmed baking sheet.
3. Mix oats, brown sugar, and cinnamon together in a bowl; cut in butter until evenly combined. Spoon 1/4 of the oat mixture into each apple.
4. Bake in the preheated oven until apples are tender and filling is bubbling, about 30 minutes.
The baking sheet needs to be rimmed to avoid butter spilling into the oven.
Aluminum foil helps keep food moist, ensures it cooks evenly, keeps leftovers fresh, and makes clean-up easy.