Step 1

Preheat oven to 375°F.

Step 2

In a mixing bowl, combine apples, lemon juice, and vanilla. Toss to combine.

Step 3

Layer apple slices in baking pan: Layer sliced apples in a 9 x 13-inch (or approximately the same size) baking pan.

Step 4

Make topping: Combine brown sugar, cinnamon, and oatmeal in a bowl. Cut in the butter. Sprinkle sugar mixture over apples.

Step 5

Bake: Bake at 375°F for 45 minutes or until topping looks crunchy and apples are tender.Serve with whipped cream or vanilla ice cream.