1/4 teaspoon ground cinnamon
1/2 cup rolled oats
1/4 cup butter, room temperature
Preheat oven to 375°F.
Layer sliced apples in a 9-inch (or approximately the same size) baking pan.
Combine brown sugar, cinnamon, and oatmeal in a bowl. Cut in the butter.
Sprinkle sugar mixture over apples.
Bake 45 minutes or until topping looks crunchy and apples are tender.